INDEX. 
page 
Brewster, David, LL. D., on the action of crystallized 
surfaces upon light, - - 145 
on the optical and physical 
properties of Tabasheer, - - 283 
Brinkley, John, D. D., the results of observations made 
at the Observatory of Trinity College, Dublin, for de- 
termining the obliquity of the ecliptic, and the maxi- 
mum of the aberration of light, - - - 241 
C 
Chronometer , observations for the error of it, - - 439 
Clifton , in Yorkshire, operations for determining the varia- 
tion in the length of the pendulum vibrating seconds at 
that station in the Trigonometrical Survey, - - 371 
; its latitude, - - 395 
Clock, comparisons of it with the chronometer, - - 434 
observations for determining its rate at different 
stations of the Trigonometrical Survey, - - 427 
Corpora lutea, a treatise on the subject of them - 59 
are produced previous to, and independent 
of, sexual intercourse, - 60 
never met with before puberty, - - 59 
Crystals, absorbing, list of those with one axis, - 15 
list of those with two axes, - - 19 
Crystals, doubly refracting , on the influence of their polar- 
ising force, upon the polarising force which accompanies 
partial reflection, - - - - 150 
on the change produced upon 
the polarising angle by their interior forces, - - 150 
on the change produced upon the 
polarisation of the reflected ray by their interior forces, 152 
D 
Davis's Straits, and Baffin's Bay , observations to determine 
the variation of the needle in those places, - - 140 
Davy, Sir Humphry, Bart., some observations on the 
formation of mists in particular situations, - - 123 
Dungeness , meeting of the tides there, - - 223 
Dunnose, operations for determining the variation in the 
length of the pendulum vibrating seconds at that sta- 
tion in the Trigonometrical Survey, - - 379 
