[ 6o 7 3 
c. 
Cardan. Appendix to a paper concerning a method of extending his rule for refolving 
one cafe of the cubic equation x 3 — q xz zzr to the other cafe of the fame equation 
which it is not naturally fitted to folve, and which is therefore called the irreducible 
cafe, p. 85. A conjecture concerning the method by which his rules for refolving 
the cubic equation x 3 -\ -q xzzzr in all cafes (or in ail magnitudes of the known quan- 
tities q and r) and the cubic equation x 3 — qxzzr in the firft cafe of it (or when r is 
greater than — or — is greater than ^ ^ were probably difeovered by ScipioFer- 
. 3 \/ 3 4 2 7 ' 
reus, of Bononia, or whoever elfewas the firft inventor of them, p. 221, A paradox 
in his theorem cleared up, p. 407. His rule ufeful in the folution of equations that 
have three real roots, p. 443. 
Cattle . Hillory of the diftemper among the horned, in 1769, p. 536. 
Cav alio ^ Mr. Thermometrical experiments and obfervations by, p. 381. New expe- 
riments in electricity by, p. 27. 
Cazaud , , Mr. His method of conftruCiing mills for fugar-canes, p. 318. 
Chemical obfervations on the poifon of Ticunas, p. 167. 
Chcjlon , Mr. His account of an offification of the thoracic duCl, p. 323. 
Chicken-pox . Difference between it and the finall, in its appearances, p. 134. 
Chymijls. A produce of petrefa&ion not noticed by them, p. 330. 
Chryjlals . Fragments of large regular ones picked up in an excursion to Vefuvius, p. 48. 
Cochin , Mr. His account of an appearance in a mift, p. 137. 
Cold . Account of a moll extraordinary degree of, at Glafgow, in January, 1780, p. 
431. Cooling procefs takes place in fome circumftances, but depends upon prin- 
ciples different from evaporation or chymical folution, p. 469. Air feldom depofits 
its contents upon bodies not colder than itfelf, p. 471. 
Colours . EffeCls of the light of the fun and a lamp upon Thermometers whofe balls are 
painted of different colours, p. 388. 
"La Condamine , Mr. Miftaken in fome affertions relating to the Indian poifon, p. 167. 
Copper-ores . New method of aflaying them, by Dr. Fordyce, p. 30. Principles on 
which troublefome roaftings and fufions in great degrees of heat may be avoided, and 
the feveral fubftances contained in the metal fhewn, p. 33. Cheapnefs and other ad- 
vantages of this procefs, p. 36. The copper from blue vitriol may be precipitated by 
iron, p. 37, Which is the molt proper acid menflruum for copper ores, p. 38. Pro- 
cefs ufed in the aftay of, p. 39. Criterion to judge whether any of the copper be 
loft during the procefs, p. 40. 
Countries expofed to noxious exhalations, wholefomer in fummer than winter, p. 370* 
Crell Profefibr. Some experiments on a new animal acid, p. 109. 
Cubic; See Equation . 
Deck* 
