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Circulating blood , experiments and observations to prove that 
the beneficial effects of many medicines are produced 
through the medium of it, more particularly that of the 
colchicum autumnale upon the gout, - - 257 
Circulation , the different kind of substances which produce 
specific diseases, supposed to be first carried into the cir- 
culation, - - - 261 
Colchicum autumnale, a specific remedy for the gout, 257 
- the infusion of it can be received into 
the circulation without producing any permanent mis- 
chief, - 262 
— . its beneficial effects upon gout produced 
through the medium of the circulation, - 262 
infusion of it was conveyed into the circulation of a dog 
by the jugular vein, - - 260 
a description of another case where 160 
drops of an infusion of it were introduced into the circula- 
tion of a dog, - 263 
Crystals, doubly refracting, on the communication of their 
structure to glass, muriate of soda, fluor spar, and other 
substances, by mechanical compression and dilatation, 156 
Crystalline lens , on the structure of it in fishes and quadru- 
peds, as ascertained by its action on polarised light, 311 
Cupim , (ivhile ants), a description of numerous nests of them 
in Brasil, - - - 278 
D 
Davy, Sir Humphry, LL. D. On the fire-damp of coal 
mines, and on methods of lighting the mines so as to pre- 
vent its explosion, 1 
— an account of an invention 
for giving light in explosive mixtures of fire-damp in coal 
mines, by consuming the fire-damp, 23 
- * — — farther experiments on the 
combustion of explosive mixtures confined by wire-gauze, 
with some observations on flame, - - 115 
Diamond , on that employed in cutting glass, - 265 
a distinction to be made between its powers of 
scratching and cutting, - - 2 65 
— — — — — those which are natural, and distinctly crystallized 
(termed sparks) preferred for the use of the glazier, 
265 
