o'clock in the morning, the variation was 24° 28': 35 minutes after it increased to 24° 35′ 31′′: in the course of the day several loud claps of thunder were heard in the north-west.

The observations in each line of the table apply to a period of twenty-four hours, beginning at 9 A. M. on the day indicated in the first column. A dash denotes, that the result is included in the next following observation.

70 54

62.0

54

44

58

REMARKS.

Sixth Month.-7. Much Cirrocumulus, a. m. in beds at a considerable elevation: in the evening a group of thunder clouds in the S and SE, which passed after a single peal of thunder to the eastward. 8. Windy: light showers, a. m.: heavier rain, p.m. 9. Stormy wet day and night. 10. Showers: Cumulostratus at sun-set. 11. Fine morning. 13. Wet, blowing day: stormy night. 14. Much wind and cloud, a. m.: slight shower: evening more settled. 15. Windy at NW, a.m.: Cumulus, with Cirrostratus: Cumulostratus: fair: Stratus at night. 16. Fine: Cirrus at evening. 17. A Stratus visible at four, a. m.: very fine day: luminous twilight, with the moon conspicuous: Cirri after sun-set. 19. Hot sun-shine: fair. 20. Lightning this evening. 21. Stratus at night. 22. Continued thunder in the SE, p. m. 23. Rather cloudy, a. m.: a fine breeze. 24. Morning cloudy, then fine: in the evening, heavy rain, with hail, thunder, and lightning: hygr. before the storm at 36°. 25. Cloudy morning. 26. Misty morning drizzling rain: then fine. 27. A thunder-storm between six and seven in the evening: very heavy rain, with thunder and lightning. 28. Heavy showers, evening. 29, 30. Cloudy, with showers.

Seventh Month.-5. Thunder in a mass of clouds to the south and south-west: some rain with us.

ANNALS

PHILOSOPHY.

SEPTEMBER, 1817.

ARTICLE I.

Biographical Account of Dr. Ingenhousz.

By the late Maxwell Garthshore, M.D. F.R.S.

JOHN INGENHOUSZ was born of a mercantile family in Breda, in the year 1730. He was educated at schools there, and afterwards studied at more than one of the Dutch or German Universities. He took a degree in physic, and settled in his native town, where he practised with success for a few years: but of this practice he soon became tired; and, being naturally indifferent of money, though at the same time strictly economical, and having a moderate independence, he could no longer resist his ardent love of knowledge, and at once determined to sacrifice his hopes of gain at Breda; and, like Pythagoras, Plato, and others, to visit countries and people from whom more could be learned.

From the publications of the Royal Society, and the characters of our philosophers, he was induced to come to London in 1764, and was luckily introduced to Sir John Pringle, through whom he became acquainted with Dr. Franklin, Dr. Huck, and all that circle of literary men that then attended his Sunday and Wednesday nights' meetings. The unassuming mildness and unaffected simplicity of our philosopher's manners, with his unremitting attention to scientific pursuits, soon gained him the favour of all; and his peculiar attention and accommodating respect to Sir John, who was always partial to foreigners, thinking they did more justice to his merit than his own countrymen, rendered Dr. Ingenhousz a particular favourite, and, by degrees, his constant visitor and attendant on all occasions.