CONTENTS 
Q 
V 
1 
i 
&Z7X 
I; ? ' 
OF 
No. XVII. 
Page 
Art. I. Biographical Memoir of Count Claude Louis Ber- 
THOLLET, - 1 
II. Account of Captain Hodgson’s Journey to the Source 
of the Jumna, and. of the Snow Excavations at Jum- 
notri, formed by the steam of Hot Springs, - 7 
III. On Petrifactions, or Fossil Organic Remains. By Ba- 
ron Alexander Humboldt, - 20 
IV. On certain Electrical Phenomena observed at Sea, with 
an Account of the Fire of St Elmo, 55 
V. Account of Captain Scoresby’s Magnetical Discove- 
ries, and of his Magnetimeter and Chronometrical 
Compass, - - - - - 41 
VI. Description of Achmite, a New Mineral from Norway, 
found and described by P. Strom, - -55 
VII. On the Measurement of the Progress of an Eclipse of 
the Moon with a Sextant, or Reflecting Circle. By 
T. E. Bowdich, Esq. Communicated by the Author, 57 
VIII. Remarks on the Increase of the Population of the United 
States and Territories of North America, with Ori- 
ginal Tables, deduced from the American Popula- 
tion Returns, to illustrate the various Rates of In- 
crease in the White Population and Slaves, and also 
the Comparative degrees in which Agriculture, Com- 
merce and Manufactures prevail. By George Har- 
vey, Esq. M.G.S., M.A.S., &c. (Continued from 
VoL VIII. p, 339.)— -Slave Population, - 6‘3 
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