INDEX. 
I 
page 
Jacob, Arthur, M. D. an account of a membrane in the 
eye, now first described, - 300 
Isle of Wight , operations for determining the variation in 
the length of the pendulum vibrating seconds at that 
station in the Trigonometrical Survey, - - 379 
K 
Kangaroo, the ova of that animal described, - 235, 237 
Kater, Capt. Henry. An account of experiments for 
determining the variation in the length of the pendulum 
vibrating seconds at the principal stations of the Tri- 
gonometrical Survey of Great Britain, - - 337 
Appendix to his Account of expe- 
riments, &c. - - - 427 
L 
Latitudes and Longitudes of the different stations in the 
Trigonometrical Survey, - - - 384 
Leith Fort, operations for determining the variation in the 
length of the pendulum vibrating seconds at that station 
of the Trigonometrical Survey, - - 36 4 
its latitude, - - - 392 
Light , on the action of crystallized surfaces upon it, - 145 
= polarised , on the laws which regulate its absorption 
by doubly refracting crystals, - - 11 
on the absorption of it by crystals with 
one axis of double refraction, 12 
— on the absorption of it by crystals with 
two axes of double refraction, 17 
transmitted, on the effects produced upon it by a 
change in the mechanical condition of the surfaces of 
crystals, - 146 
London , operations for determining the variation in the 
length of the pendulum vibrating seconds at that sta- 
tion in the Trigonometrical Survey, - - 377 
its latitude, - - 407 
