INDEX. 
page 
Tannin , formed by action of nitric acid, on substances reduced 
to the state of coal, whether by fire, or by sulphuric acid, 219 
— — additional remarks on it, - 285 
its indestructibility, - 286 
• its imputrescibility, - - - 288 
on the destructibility of various kinds of natural tannin, 288 
artificial substance distilled, - - - 292 
— — — — formed by action of nitric acid on va- 
rious substances not carbonized, - - 295 
probably formed by simple 
exposure of some substances to a certain temperature, - 302 
Telescopes , experiments on their power ol ascertaining the mag- 
nitudes of very small celestial objects, - - 31 
Torpedo, its battery probably governed by a voluntary muscle, 1 1 
u 
Ur an glimmer, experiments on, - - - 331 
Variation of compass on board ship, arising from position of the 
ship's head, - - - - - 186 
of the magnetic needle at Somerset-house, at the end 
of the Meteorological Journal, - - - [27] 
w 
Wavellite, on a fossil from Devonshire so called, - 155 
Wollaston, William Hyde, M. D. On the discovery of 
palladium ; with observations on other substances found with 
platina, - - - » - - 316 
Wood, winter-felled more dense than summer-felled, - 93 
Wootz, experiments on, - 163 
Y 
Young, Thomas, M. D. An essay on the cohesion of fluids, 65 
z 
Zeolite, experiments on a mineral substance resembling it, 155 , 331 
— yielding a peculiar 
sublimate, 
— properties of the sublimara^.- • t 
Aw 
334 
341 
From the Press of 
W. BULMER & Co. 
Cleveland-Row , St. James's. 
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