INDEX. 9 



neglected by the French, 19, 20 — ufed by the Chlnefe, 33 — !ts (moke 



thought to be falubrious, 20 — in kindling dilcharges much moifture, 



54- 



Cocoons of America larger dian the Italian, and the filk Rronger, but lefs 

 fine, preface Vol. I. p. vi. 



Cold, produced by admixture of certain bodies, Vol. I. append'ix^. 32. 



Collin (DoBor Nicholas) his eflay, by way of introduction, on natural philo- 

 fophy, Vol. III. page ili — his defcription of a machine invented by 

 himlelf for faving perfons from the upper (lories of a houfe on fire. 

 Vol. IV. p. 143 — his philological view of fome very ancient words in 

 feveral languages, 476 — his defcription of a fpeedy elevator 519. 



Comet of June and July 1770, account of it by Mr. Rittenlioufe, Vol. I. ap- 

 pendix p. 37— its imcommon velocity, ib. 46 — fmallnefs of fize and 

 Ihort time vifible, 371046 — its elements and motion, 38 — method of 

 computing its vifible place and diftance from the fun, ib. et 39 — curi- 

 ous conjedlure concerning comets, ib. — M. Meffier difcovers tills comet 

 in France, 41 — his obfervations on it, ib. — difcovered in England by 

 Mr. Six, 44, with his obfervations on it, ib. — Lord Stirling's account 

 of it, 45 — obfei-valions on one lately difcovered, Vol II. p. 195 — ac- 

 count of another. Vol. III. p. 261. 



Comets, an elTay on the ii:'e of, with conjeftures on the origin of heat. Vol. 

 I. appendix p. 27 — have no light of their own, p. 28 — their luminous 



trains accounted for, 29 — their prefumable temperature, ib Newton's 



opinion of comets, ib. — conceived the refidence of intelligent beings, 30 

 — immenfe height of their atmofphere, and its fuppofed ufe, 35. 



Committee of hufbandry's obfervations on the fly weevil. Vol. I. p. 218. 



Committees appointed by the A. P. S. for obferving the tranfit of Venus over the 

 fun. Vol. I. p. 8, 44, 82, 89 — of Mercury, 82. 



— — for reporting on die pradicability ot a canal between Delaware 



and Chefapeak, Vol. I. p. 293 — tlicir reports, 294, 295, 296. 



Conpafs (manner's) an eafy method ot finding its variadon. Vol. II. p. 251— 

 a propofed make-fhift for the, 318 — improvements on it, 396. 



Condenjation of eledric air leffens its capacity. Vol. II. p. 79. 



Condiiflors of lightning, an addition propofed to, Vol. III. p. 125 — improve- 

 ment on, 322. 



Cone<waga hills (Pennf.) bafaltes and granite foimd thereon, Vol. IV. p. 445. 



ConneSicut, longevity of its people. Vol. III. p. 39 — deaths at Milford in, 

 ib. 



Contents of Vol. I. p. xxiii — of Vol. II. p. xxix — of Vol. III. p. xxxvi — of 

 Vol. IV. p. xl. 



Copper (hardened) in ufe among the Mexicans, the Greeks and Romans, 

 Vol. IV. p. 200, 202 — aUb the N. American Indians, 203. 



Country compared with towns, as to number of deaths. Vol. III. p. 4.1. 



Cooke (John) his defcripdon of a new ftandard for weights and meafures. 

 Vol. III. p. 328. 



Coombe (Thomas) his meteorological obfervadons made by him at Phila. 

 1770-1, Vol. I. appenditt p. 70. 



CorreBion] 



