INDEX. 
D 
Darwin, his opinion on the pairing of cuckoos, declared hasty, 
42. 
Davy, Dr. John, on a case of pneumato-thorax, 257. 
Davy, Sir Humphry, Bart. P. R. S. on the corrosion of copper 
sheathing by sea water, 151. 
- — on the application of electrical combinations to the pre- 
servation of copper sheathing of ships, 151, 243. 
Decussation (semi) of optic nerves. — Dr. Wollaston on, 222 ; 
see semi-decussation — Blindness. 
Density of the earth's atmosphere. — Bessel’s expression for, 58. 
— - an hypothetical expression of the pressure in terms of, 
which gives a finite refraction, 159- 
— — — ef air — effect of on rates of chronometers, 372. 
Dillwyn, Lewis Weston, Esq. on fossil shells, in a letter to 
Sir H. Davy, 413. 
Diving of ducks, dogs, & c. 
Dobereiner, his experiments on the action of spongy platina 
on gaseous mixtures, 267. 
Dublin , observations made at, and at Greenwich — comparison of 
by Dr. Brinkley, 50, &c. 471, et seq. 
Dunnose, latitude of (50° 37' 5". 27 N), 368. 
Duodenum , of walrus, how supplied with bile, 235. 
E 
Earth — Newton’s and Huygens’s theories of its figure, 108 — 
Clairaut’s, 108—Euler’s, 109 — chargeable with an omission, 
1 10 — Mr. Ivory’s viewof, 1 1 1 — 122. —Exposition of its theory 
in general, 146 — ellipticity of, 369. — Radius of its equator, 
taken at 3486908 fathoms, and its semi-axis at 3475560, 370. 
Earth-worm ; see worm, earth. 
Electricity, comparative of hard and soft steel, 354 — modulus 
of, 358. 
* of steel not altered by temper, according to Coulomb 
and Young, 354. — Confirmed by experiments by Tredgolb, 
356, 357. 
Electric currents, their effect in producing motion in fluids, 162. 
Electrical states of bodies, their influence in exalting, modifying, 
or destroying chemical affinities, 153. 
