admirable mode in which they are laid, aided by the power of their works, they are enabled to supply gas at Highgate Hill (seven miles distance) with the same precision and in the same abundance as at Vauxhall. The extent of their pipes exceeds one hundred and fifty miles.

The cost of light equivalent to that of seven mould candles (six to the pound) is in coal-gas three farthings per hour, in an Argand oil-lamp 3d. per hour, in mould candles 3d. per hour, and in wax candles 1s. 2d. per hour.

Gas has also been manufactured from oil, rosin and other substances. Oil-gas is procured abundantly by the decomposition of oil, trickled into a red-hot retort, half-filled with coke or brick. It contains no sulphuretted hydrogen, requires no purification, and is much richer in carburetted hydrogen than coal-gas. Its expense has however led nearly to the entire disuse of this kind of gas.

In London there are eighteen public gas establishments and twelve companies; the capital invested in works and apparatus is estimated at 3,000,000l.]

NIGHT-WATCH.

THE establishment of those people who are obliged to keep watch in the streets of cities during the night, belongs to the oldest regulations of police. Such watchmen are mentioned in the Song of Solomon, and they occur also in the book of Psalms. Athens and other cities of Greece had at least sentinels posted in various parts; and some of the thesmothetæ were obliged to visit them from time to time, in order to keep them to their duty'. At Rome there were triumviri nocturni, cohortes vigilum, &c.

1 They were called bell-bearers or bellmen, because while going the rounds they gave a signal with their bells, which the sentinels were obliged immediately to answer. See the Scholiasts on the Aves of Aristophanes, ver. 841. Dio Cassius, lib. liv. 4, p. 773, says, "The watchmen in the different quarters of the city have small bells, that they may make signals to each other when they think proper." The bells therefore did not serve for announcing the hours, as some have imagined.

The object of all these institutions seems to have been rather the prevention of fires than the guarding against nocturnal alarms or danger; though in the course of time attention was paid to these also. When Augustus wished to strengthen the night-watch, for the purpose of suppressing nocturnal commotions, he used as a pretext the apprehension of fires only. The regulations respecting these watchmen, and the discipline to which they were subjected, were almost the same as those for night-sentinels in camps during the time of war; but it does not appear that the night-watchmen in cities were obliged to prove their presence and vigilance by singing, calling out, or by any other means. Signals were made by the patroles alone, with bells, when the watchmen wished to say anything to each other. Singing by sentinels in time of war was customary, at least among some nations; but in all probability that practice was not common in the time of peace1.

Calling out the hours seems to have been first practised after the erection of city gates, and, in my opinion, to have taken its rise in Germany; though indeed it must be allowed that such a regulation would have been very useful in ancient Rome, where there were no clocks, and where people had nothing in their houses to announce the hours in the nighttime. During the day people could know the hours after water-clocks had been constructed at the public expense, and placed in open buildings erected in various parts of the city. The case seems to have been the same in Greece; and rich families kept particular servants both male and female, whose business it was to announce to their masters and mistresses certain periods of the day, as pointed out by the city clocks. These servants consisted principally of boys and young girls, the latter being destined to attend on the ladies. It appears, however, that in the course of time water-clocks were kept also in the palaces of the great: at any rate Trimalchio, the celebrated voluptuary mentioned in Petronius, had one in his dining-room, and a servant stationed near it to proclaim the progress of the hours, that his master might know how much of his lifetime was spent ; for he did not wish to lose a single moment without enjoying pleasure.

The Persian sentinels sung in this manner when they were surprised in the city by the Romans.-Ammianus Marcell. xxiv. 15.

I have not read everything that has been written by others on the division of time among the ancients; but after the researches I have made, I must confess that I do not know whether the hours were announced in the night-time to those who wished and had occasion to know them. There were

then no clocks which struck the hours, as has been already said; and as water-clocks were both scarce and expensive, they could not be procured by labouring people, to whom it was of most importance to be acquainted with the progress of time. It would therefore have been a useful and necessary regulation to have caused the watchmen in the streets to proclaim the hours, which they could have known from the public water-clocks, by blowing a horn, or by calling out.

It appears, however, that people must have been soon led to such an institution, because the above methods had been long practised in war. The periods for mounting guard were determined by water-clocks; at each watch a horn was blown, and every one could by this signal know the hour of the night2; but I have met with no proof that these regulations were established in cities during the time of peace, though

1 That the servants in many houses were wakened by the ringing of a bell, appears from what Lucian says in his treatise, De iis qui mercede conducti in divitum familiis vivunt, cap. xxiv. p. 245, and cap. xxxi. p. 254, Bipont edition, vol. iii. It does not however follow that there were then striking or alarm-clocks, as some have thence concluded. See Magius De Tintinnabulis, cap. 6, in Sallengre, Thesaurus Antiquit. ii. p. 1177.

2 Vegetius De Re Milit. iii. 8. That Cæsar had such clocks may be concluded from the observation which he makes in his Commentaries, on the length of the day in the islands near Ireland, lib. v. 13. Maternus, in Romische Alterthümer, iii. p. 47, endeavours to prove by what Suetonius relates of Domitian, cap. 16, that this prince had in his palace neither a sun-dial nor a water-clock. But what kind of a proof! Domitian asked what the hour was, and some one answered, the sixth. Such insignificant dicta probantia have been banished from philosophy by the moderns, and ought they not to be banished from antiquities likewise? The oftenquoted passage also of Valerius Maximus, viii. 7, 5, proves nothing, unless we first adopt the amendment of Green. Carneades, it is said, was so engaged in the study of philosophy, that he would have forgot his meals had not Melissa put him in mind of them. Green reads monitrix domestica; but Valerius says, "Melissa, quam uxoris loco habebat." See Sallengre, Thes. Antiq. Rom. i. p. 721. A passage likewise in Pliny's Epistles, iii. 1, p. 181, "ubi hora balinei nunciata est," does not properly prove that it alludes to one of those boys who announced the hours. That such servants however were kept, is evident from the undoubted

many modern writers have not hesitated to refer to the nightwatch in cities what alludes only to nocturnal guards in the time of war. On the contrary, I am still more strongly inclined to think that ancient Rome was entirely destitute of such a police establishment. The bells borne by the night watchmen were used only by the patroles, as we are expressly told, or to give signals upon extraordinary occasions, such as that of a fire, or when any violence had been committed. Cicero, comparing the life of a civil with that of a military officer, says, "The former is awaked by the crowing of the cock, and the latter by the sound of the trumpet." The former therefore had no other means of knowing the hours of the night but by attending to the noise made by that animal. An ancient poet says that the cock is the trumpeter which awakens people in the time of peace. The ancients indeed understood much better than the vulgar at present, who are already too much accustomed to clocks, how to determine the periods of the night by observing the stars; but here I am speaking of capital cities, and in these people are not very fond of quitting their beds to look at the stars, which are not always to be seen.

Without entering into further researches respecting watchmen among the ancient Greeks and Romans, I shall prove, by such testimonies as I am acquainted with, that the police establishment of which I speak is more modern in our cities than one might suppose. But I must except Paris; for it appears that night-watching was established there, as at Rome, in the commencement of its monarchy. De la Mare3 quotes the ordinances on this subject of Clothaire II., in the year 595, of Charlemagne, and of the following periods. At first the citizens were obliged to keep watch in turns, under the command of a miles gueti, who was called also chevalier. The French writers remark on this circumstance, that the term guet, which occurs in the oldest ordinances, was formed from the German words wache, wacht, the guard, or watch; and in like manner several other ancient German military

testimony of various authors. Martial, viii. ep. 67.-Juven. Sat. x. 216. -Seneca De Brevit. Vitæ, c. 12.-Alciphron, Epist. lib. iii. p. 282.Sidon. Apollin. ii. ep. 9, p. 120.

Cic. Orat. pro Muræna, cap. 22.

2 Sil. Ital. vii. 155.

Traité de la Police, vol. i. in the Index under the word Guet.

terms, such as bivouac, landsquenet, &c.1 have been retained in the French language. In the course of time, when general tranquillity prevailed, a custom was gradually introduced of avoiding the duty of watching by paying a certain sum of money, until at length permanent compagnies de guet were established in Paris, Lyons, Orleans, and afterwards in other eities.

If I am not mistaken, the establishment of single watchmen, who go through the streets and call out the hours, is peculiar to Germany, and was copied only in modern times by our neighbours. The antiquity of it however I will not venture to determine2. At Berlin, the elector John George appointed watchmen in the year 15883; but in 1677 there were none in that capital, and the city officers were obliged to call out the hours 4. Montagne, during his travels in 1580, thought the calling out of the night-watch in the German cities a very singular custom. "The watchmen," says

1 Bivouac, from the German beiwacht, is an additional night-guard during a siege, or when an army is encamped near the enemy. Lansquenets were German soldiers added by Charles VIII. of France to his infantry, and who were continued in the French army till Francis I. introduced his legions.-TRANS.

2 [With respect to the institution of night-watch in this country, Stow says, "For a full remedy of enormities in the night, I read, that in the year 1253 Henry III. commanded watches in the cities and borough towns to be kept, for the better observing of peace and quietness among his people.... And further, by the advice of them of Savoy, he ordained, that if any man chanced to be robbed, or by any means damnified by any thief or robber, he to whom the charge of keeping that country, city, or borough, chiefly appertained, where the robbery was done, should competently restore the loss. And this was after the use of Savoy, but yet thought more hard to be observed here than in those parts; and therefore, leaving those laborious watches, I will speak of our pleasures and pastimes in watching by night." (Survey of London, Thoms's edition, 1842, p. 39.) He then describes the marching watches which were instituted in the months of June and July, on the vigils and evenings of festival days; with the cresset lights, &c. But he does not state whether these watches were continued in his time; nor does he state the author of the information which he gives us from his reading. The statute of Winchester, 13 Edward I. c. 4, enforces a continuation of the watches as they had previously been made, from Ascension-day to Michaelmas-day; the night-watch from sun-set to sunrise, in every city by six men at each gate, in every borough by twelve men, in every open town by six or four men.]

3 Nicolai Beschreib. von Berlin, i, p. 38.

4 Ib. p. 49.