292 
INDEX, 
y ditto, by W. N. 85. 
' ditto, by Sir George Cayley, 
167. 
Heat, quantity of, developed in the 
combustion of different species of 
wood. By Count Rumford, 115. 
— , developed in the combustion 
©f birch wood, 108. 
, - , ditto of various wood, 111. 
. , quantities of, lost in the car- 
bonization of wood, 115. 
Herschel, Dr., his observations on a 
second comet, 193. 
— — , the body, ibid. 
. the chevelure, 195. 
— , the tail, 196. 
, Remarks, ibid. 
Henry, Win., on the theories of the 
excitement of galvanic electricity, 
259. 
Howard, L. Esq., his remarks and 
results on the Meteorological Journal, 
7. 132. 174. 228. 
■ ■ , on the meteors commonly 
called shooting or falling stars, 8. 
Hydraulic Apparatus, description of, 
Mr. Wm, Close’s, 210, 
Is 
Ibbetson, Agnes, Mr3., on the forma- 
tion of the seeds of plants and other 
objects, relative to their construction, 
19 
, on the wood and bark of trees 
much magnified, 87. 
Illustrations, practical, on the methods 
of calculation used by Z. Colburn. 
By Mr, S. Ellis, 9. 16. 
Inquiries relative to the structure of 
wood, and the specific gravity of its 
solid parts, and the quantity of liquids 
and elastic fluidscontained in it under 
various circumstances, the quantity 
of charcoal to be obtained from it, 
and the quantity of heat produced 
by its combustion. By Count Rum- 
ford, 95. 
Inquiries concerning the mutual de- 
composition of soluble and insoluble 
salts. By M.Dulong, 271. 
Iron bridge, method of constructing, 
with one arch of extensive span, pro- 
posed to be carried over the Meuai. 
By Thomas Telford, Esq,, l. 
J. 
Journal, Meteorological, with remarks 
and results. By L. Howard, 7. 132. 
174. 228. 
L. 
Layman, Capt., on the preparation of 
forest trees for immediate use, and 
increasing the duration of timber, 51 . 
Letter respecting an error in Mr. 
Woodward’s elementary treatise on 
astronomy. ByD.T. 177. 
Letter from Mr. Wm. Close on hi« 
hydraulic machine, acting with a 
variable quantity of water, 210. 
Lisiansky, Captain, his circumnaviga- 
tory voyages, 78. 
Lussac, M., Gay, upon the deliqm- 
es ce of bodies, 57. 
M. 
Method of constructing an iron bridge 
