INDEX. 
page 
Glass , heated , and unannealed glass drops , on their optical pro- 
perties and structure, - - - i 
, annealed flint, its specific gravity measured, - 3 
Glass drop , unannealed flint, its specific gravity ascertained, 3 
Glass drops , unannealed , the best method of obtaining them 
entire, pointed out, 6 
H 
Hastings, Mr. Effect of his experiment of immersing the 
hind legs of a frog in tincture of opium, - - 75 
Heart, experiments made with a view to ascertain the prin- 
ciple on which its action depends, and the relation which 
subsists between that organ and the nervous system, 65 
its action maybe influenced by agents applied to any 
considerable portion of the brain or spinal marrow, 78 
— its power independent of the brain and spinal marrow, 78 
— retains its power after the brain and spinal marrow are 
removed, - 84 
is influenced by every part of the nervous system, 436 
Herschel, William, JLL.D. A series of observations of 
the satellites of the Georgian planet, including a passage 
through the node of their orbits ; with an introductory 
account of the telescopic apparatus that has been used on 
this occasion ; and a final exposition of some calculated 
particulars deduced from the observations, - 293 
Home, Sir Everard, Bart. On the structure of the organs 
of respiration in animals which appear to hold an inter- 
mediate place between those of the class pisces and the 
class vermes, and in two genera of the iast mentioned 
class, - 256 
■ On the mode of generation 
of the lamprey and myxine, - - 265 
I 
Iceland spar, on the phenomena exhibited by particular 
specimens of it, - - - - 271 
Jellies , animal , effects of pressure on them, - 61 
Images, on their multiplication, and the colours which accom- 
pany them, in some specimens of calcareous spar, - 2 70 
Involution and evolution of numbers, description of a new in- 
strument for performing them mechanically, - 9 
f 
