INDEX. 
D page 
Davy, Edmund, Esq. On some combinations of platinum, 108 
Deafness, instances of a particular species of partial deaf- 
ness, or insensibility of very acute sounds, - 310 
Dugong, some account of that animal, - - 174 
a description of its external appearance, - 175 
dissection of it, - - 177 
its food, - - - 179 
never found on land, or in fresh water, but ge* 
nerally in the shallows and inlets of the sea, - 180 
its dimensions, - - - - 181 
the ventricles of the heart of this animal com- 
pletely detached, - - - 319 
particulars respecting the anatomy of this animal, 
intended as a supplement to Sir T. S. Raffles’ account, 315 
on the milk tusks, and organ of hearing of this 
animal, - - - 144 
a section of the milk tusk of the narwhal and of 
the elephant, compared with a similar section of that of 
the dugong, - - - - - 147 
Dugong Ikan, considered by the Malays as a royal fish, 180 
>the Malays distinguish two varieties, the du- 
gong bumban, and the dugong buntal, - - 180 
E 
Eustachian tube, is closed by suddenly checking the effort 
of inspiration, - 30 9 
— is opened by swallowing or incipient 
yawning, - - 309 
F 
Fisher, George, Esq. On the errors in longitude as deter- 
mined by chronometers at sea, arising from the action 
of the iron in the ships upon the chronometers, - 196 
Foetus, human, a case of one found in the ovarium, of the 
size it usually acquires at the end of the fourth month, 101 
Frames, or ribs of ships, a new principle of uniting them 
recommended, - - - - 134 
