I N D E X. ^ 
Cbelfea plants. See Hudfon. 
Circulation of the blood from the mother to the foetus* 
and from the foetus to the mother, proved , from the 
confideration of a monftrous child, p. 16, 17. 
Clarke , Mr. his account of tall men feen near the Streights 
of Magellan, p. 75. 
Clujlers , of ftars probably belong to the fame fyftem, 249. 
Cod , contains feveral millions of eggs, p. 287. 
Cold , greateft in London, p. 445. Norwich, 444. Ply- 
mouth, ibid. Derby, 265. 
Cold , or heat, what degree produced by acids mixed with 
alkalies, p. 514. 
Collinfon , Peter, F. R. S. his account of foffil teeth found 
in North America, p. 464. 468. 
Comet , of 1665, three times and a half denfer than the 
earth, p. 148. of 1672, as 11 to 5, 149. 
Comets , a method of inved.igating their denfity, by means 
of the height of their tails, p. 146. Probably denfer 
as they approach nearer to the fun, 150. 
Communication of the umbilical vein with the aorta, in- 
ferior in a monfter fufpected, by Mr. Le Cat, p. 14, 
Confervas , what plants they are, p. 421. Some of them 
of the ciafs of Dioecia, 424. Several beautiful fpecies 
of them, ibid. 
Cook, Mr. James, his obfervation of an eclipfe of the fun, 
at Newfoundland, p. 215. 
Coral Banks, raifed by the winds, form into fhoals, p. 39.;. 
Become a bar to coagulate the fand, ibid. And being 
enriched by the dung of birds and cafl-up vegetables, are 
covered with mould, and become iflands, 396. 
Corallines , when burnt, have the i'mell of burnt bones, 
p. 410. Give by diftillation volatile alkali, falts, and 
oils, 41 1. 
Corallines , whether their pores are too minute for polypes* 
p. 413. One of them laid to be found on a heath, 415. 
By mittake, whether they contain feeds, 41^ 
Craby the mod prolific of fhell fifh, p. 288. 
Croohm*, 
t 
