tries into which the cultivation of them has never yet been introduced, and where it cannot be supposed that they accidentally became wild by being conveyed from hop-fields and gardens. The want of information in works older than the emigrations of the northern tribes, is no proof that a plant did not then exist. At that time there was no Linnæus to transmit plants to posterity, as Hipparchus, according to the expression of Pliny, did the stars. Such vegetable productions only as had become remarkable on account of their utility or hurtful qualities, or by some singular circumstance, occur in the works of the ancients. Many others remained unknown, or at least without names, till natural history acquired a systematic form; and even at present botanists have often the satisfaction to discover some plant not before observed. Is it probable that the Chinese even are acquainted with our hops? They have a kind of beer made from barley and wheat, which is called tarasun; and according to the account of J. G. Gmelin, who purposely made himself acquainted with the preparation of it, hops formed by pressure into masses, shaped like a brick, are added to it. It is well known that the Chinese have also a kind of tea formed into cakes by strong pressure. Our hops are compressed in the same manner in Bohemia; and in that state will keep without losing any of their strength for fifty years. They are put into a sack or bag of coarse canvass, and subjected to a press. A square sewed bag, each side of which is two ells, contains fifty bushels of hops prepared in this manner; and when any of them are required for brewing, the bag is made fast to a beam, and as much as may be necessary is cut out with an axe. The whole mass is of a brown colour, and has a resemblance to pitch, in which not a single hop-leaf can be distinguished. Whether the Chinese conceived the idea of employing our common hops for the like purpose, is a question of some importance in regard to the history of them; but at present I am not able to answer it. [Hops are extensively cultivated in Kent, Sussex, and Herefordshire; and to a less extent in Worcestershire, Wiltshire, Hampshire, Gloucestershire, Surrey, and several other counties. 1 Gmelin's Reise durch Sibirien. Gött. 1752, 8vo. iii. p. 55. From 50,000 to 60,000 acres of land are covered in England with hop-gardens, about one-half being in Kent; an excise duty of 18s. 8d. per cwt. is levied upon their produce. British hops are exported to Hamburg, Antwerp, St. Petersburg, New York, Australia, and other places. A trifling quantity is also imported, principally from Flanders. The duty on hops of the growth of Great Britain produced in 1842, £260,979.] BLACK LEAD. To ascertain how old the use of black lead is for writing might be of some importance in diplomatics, as the antiquity of manuscripts ruled or written with this substance, or of drawings made with it, could then be determined. The mi I allude here to pencils formed of that mineral called, in common, plumbago and molybdana, though a distinction is now made between these names by mineralogists. neral used for black-lead pencils they call reissbley, plumbago, or graphites; but under the term wasserbley and molybdana they understand a mineral once considered to be the same as the former, but which, however like it may be in appearance, differs from it in being heavier, occurring much seldomer, and containing a new metal, almost of a steel-grey colour, exceedingly brittle, and named molybdænum. Plumbago, which is the substance here meant, when exposed to an open fire, is almost entirely consumed, leaving nothing but a little iron and siliceous earth. It contains no lead; and the names reissbley and bleystift have no other foundation than the leadcoloured traces which it leaves upon paper. The darker, finer, and cleaner the lines it makes are, the fitter it is for drawing and writing. These lines are durable, and do not readily fade; but when one chooses, they may be readily rubbed out. Black lead, therefore, can be used with more convenience and speed than any coloured earth, charcoal, or even ink. It is well known that transcribers, more than a thousand years ago, when they wished their writing to be in a particular manner beautiful and regular, drew fine parallel lines, which they followed in writing. These lines may be still clearly distinguished in old manuscripts. In many instances, they have only been impressed on the parchment by some hard, sharp body; but they often exhibit a leaden colour; from which one might suppose that they had been drawn with our plumbago, and consequently believe that the use of this substance is as old as we must consider, from certain marks, the oldest ruled manuscripts. But, on a little reflection, one will be convinced that this would be a very fallacious conclusion. For lines so like those made with plumbago, that the eye can scarcely perceive the difference, may be made with lead'. It can be proved that the ancients drew their lines with lead; and this could be done with more convenience, as this soft metal was easily rubbed off by the parchment, which, being harder and rougher than our paper, had therefore more body. It is well known that, formerly, when people wished to draw lines, a small round plate of lead, which could not so readily cut the parchment or become bent as a leaden style, was employed?. Old manuscripts, ruled with lead-coloured lines, have been pointed out by modern diplomatists. Our learned Professor Schönemann, who was unfortunately hurried off by a premature death, has given a description of the Codex Berengarii Turonensis, of the eleventh or twelfth century, and the Codex Theophyli Presbyteri de Temperamento Colorum of the latter century, both preserved in the library of Wolfenbuttel; and remarks that lines are drawn on the first partly with a style and partly in a light manner with lead; but he says of the other, that it exhibits very fine lines drawn with a blacklead pencil3. Le Moine quotes a document of the year 1387, 1 Plin. lib. xxxiii. 3, sect. 19. 2 A plate of this kind was called παράγραφος, also τροχαλὸς, γυρός, KUKλоTEρns, which last appellation denotes the form. The Romans, at least those of later times, named this lead præductal. The ruler by which the lines were drawn was called kavov and kavovis. Thus the ruled sheet which Suffenus filled with wretched verses is styled by Catullus membrana directa plumbo. Pollux has παραγράφειν τῇ παραγραφίδι. See Salmasius ad Solinum, p. 644, where some passages, in which these leaden plates are described, are quoted from the Anthologia. 3 Versuchs e. System d. Diplomatik. Hamb. 1802, 8vo, ii. p. 108. which is ruled with black lead, and at the same time says that the custom of ruling ceased about the year 1421 and 1424. The lines, therefore, after that period, became crooked and oblique1. But the antiquity of black-lead pencils cannot be determined by the help of diplomatic documents. It might be traced out with more ease were it known by what mineralogical writer plumbago, and the uses of it, were first mentioned. The following is what I have remarked on this subject; but I suspect that there must be some older mention of it than any I have yet been able to find. I do not, however, believe that those who require more than bare conjecture will discover this mineral in the works of the Greeks and the Romans; for it cannot possibly be proved that it is to be understood under the terms plumbago, galena, molybdæna, and molybdoides, as has been confidently asserted by many, who, were it not superfluous, might easily be refuted. But in whatever obscurity these names may be involved, one can with certainty discover that they sometimes denote galena, or a real lead ore, or else some production of lead works. The first author in whose writings I have as yet found certain mention of plumbago is Conrad Gesner, whose name I can never pronounce without respect. In his book on fossils, printed at Zurich in 1565, he says that people had pencils for writing which consisted of a wooden handle, with a piece of lead, or, as he believed, an artificial mixture, called by some stimmi Anglicanum. Such pencils must at that time have been scarce, because he has given a figure of them in a wood-cut. To judge by this, the pencil seems to have had a wooden sheath or covering. Thirty years after, Casalpinus gave a more complete account of this mineral, which he calls molybdoides, because he thinks it was so named by Dioscorides. He says that it was a lead-coloured shining stone, as smooth as if rubbed over with oil; it gave to the fingers an ash-grey tint, with a plumbeous lustre, and pointed pencils were made of it for the use of painters and draftsmen. He adds, that it was called Flanders' stone, because it was brought from the Netherlands to Italy 2. 1 Diplomatique-pratique: à Metz, 1765, 4to, p. 62. Three years after Cæsalpinus, a still better description was given by Imperato. The latter calls the black lead grafio piombino, and says that it is much more convenient for drawing than pen and ink, because the marks made with it appear not only on a white ground, but, in consequence of their brightness, show themselves also on black; because they can be preserved or rubbed out at pleasure; and because one can retrace them with a pen, which drawings made with lead or charcoal will not admit'. This mineral is smooth; appears greasy to the touch, and has a leaden colour, which it communicates with a sort of metallic lustre. It can resist for a long time the strongest fire; it even acquires in it more hardness, and therefore has been considered as a kind of talc. Sometimes it is foliaceous, and may be crumbled to pieces in scales; but it is frequently found denser and stronger, and in this case writing-pencils are made of it. The first kind was mixed with that clay called rubrica, and manufactured into crucibles, which were exceedingly durable in the fire. It is here seen that these Italians, at that time, were well acquainted with this mineral. It has been reckoned a species of talc by Justi, by Wallerius in the first edition of his mineralogy, and also by others. Its durability in resisting heat is certainly manifested, when it is kept in a close fire and between coals. But it is proved by the experiments of modern mineralogists, that in an open, strong, and long-continued fire, it becomes almost entirely consumed. Bartholomew Ambrosinus, in the continuation of Aldrovandi's Museum Metallicum, printed at Bologna in 1648, uses the name lapis plumbarius. The short account which he gives of it has been borrowed from the two Italians last mentioned; but it deserves to be remarked, that even then he thought it worth his while to give Gesner's figure enlarged. In the works of Albertus Magnus, George Agricola, Encelius, Cæsius, Kircher, and many other old mineralogists, I have found no mention of black lead. But as the advantageous use of it for crucibles was known to Imperato, and as the crucibles made at Ips, which till very lately were employed by all the mints in Europe, and even in other parts, derived 1 This, however, is not exactly the case. With ink somewhat thick one may indeed write on a piece of paper which has been rubbed over with black lead. |