[ 3 7 o ] 
Cat . A coated phial may be charged with elettrical fparks from the back of a cat, 
flrong enough to pierce a hole through a card with its difcharge, p. 396. A fpccies 
of pole-cat (Viverra Putorius), found in Africa, p. 40. 
Cavallo , Mr. Tiberius, his account of fome new ele&rical experiments, p. 48. Sec 
Electrical experiments. His experiments and obfervations on Mr. Volta’s ele£lric I 
machine, p. 116 — iiB. His new electrical experiments and obfervations ; with an 
improvement of Mr. Canton’s electrometer, p. 388. See Ele&rical experiments. 
Cavcndifoy Mr. accounts for a difagreement between the pear-gage and the other gjges 
in an air-pump, p. 622 — 624. 
Chocolate y on its electricity ; and the reftoration of that property to it, when loll, by 
melting it together with a fmall quantity of olive-oil, p. 9 j. — 97. 
Cijlerns. Fixing the fcale of barometers with citterns, recommended, p.405, 406. 
Claujlhaly in the Hartz, depth of fome mines there determined by barometrical obferva- 
tions, p.408 — 412. 431 — 435. Its height above Gottingen determined by the 
barometer, p. 429. 444 — 449. 
Clock, A pendulum-rod of folid glafs dilates much lefs than a fteel one, p. 698, 
699. 
Coated phial may be charged with eleCtrical fparks flrong enough to pierce a hole through 
a card with its difcharge, from a piece of new flannel, a hare’s (kin, or a piece of 
paper, p. 396. 
Colours . An account of perfons who could not diflinguifh colours, p. 260. — Harris, 
who had othervvife a good fight, difcoverecl a want of the idea of colours at four 
years of age, p. 261. Why he might not obferve this defcCl earlier, ibid. Could 
not difeern the difference of colour in cherries, p. 262. He could only guefs the 
name of any colour, except diflinguifhing white from black, or black from any.light 
or bright colour, p. 262, 263. Fie could diflinguifh a ftriped ribbon from a plain 
one, but could not tell the colours, p. 26 2. Was very defirous cf undemanding the 
nature of light and colours, p. 263. Fie had two brothers, who likewife had no idea 
of colours, ibid. Account cf one of them, p. 263 — 265. 
Colours . Ele&rical Experiments on water-colours, p. 392 — 394. On oil-colours, 
p. 394, 393. 
Committee . The report of the committee appointed by the Royal Society to confider of 
the beft method of adjufting the fixed points of thermometers ; and of the precautions 
neceffary to be ufed in making experiments with thofe inflruments, p. 816. See 
Thermometers . 
Cooch Behar . Europeans and Boutaners firft met at its attack, p. 467. Their great 
furprize at each other? p. 467,. 468. Boutaners, conquered by the Europeans, fue 
for peace, p. 468, 
Copernicus , an account of a portrait of him, prefented to the Royal Society by Dr.Wolf, 
p. 33. Copied from an original in the poffeflion of Mr. Fluflarzewfki, p. 33, 34* 
A portrait of hirfi in the great church at Thorn, p. 34. Compared with Mr. Huf- 
farzewfki’s, 
