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Transactions of the american philosophical society, 
. held at Philadelphia, for promoting useful knowledge. 
Vol. VIL — New series. Part. IL and SIL Philadelphia, 
1840. 2 vol. in-4°. 
Proceedings of the american philosophical society. 
Vol. L Nov. et déc. 1840 (n° 14). — Vol. IL. Janv. à avril 
1841 (n°5 15, 16 et 17). Philadelphia, 4 broch. in-8°. 
Report of the tenth meeting of the british association 
for the advancement of science ; held at Glasgow in au- 
gust 1840. London, 1841. 1 vol. in-&. 
The Silurian system, founded an Geological Resear- 
ches in the Counties of Salop, Hereford, etc.; with Des- 
criptions of the Coal-fields und Overlying formations. By 
Roderick Impey Murchison. (From the Edinburgh Re- 
view , april, 1841 ,n° 147). Broch. in-8°, 
On the composition of chalk rocks and chalk mart by 
invisible organic bodies. By Thomas Weaver. ( From the 
Lond. Edinb. and Dubl. Philos. Mag. and Journ. of 
science. May and june 1841). London, 1841. Broch. in.8°. 
Proceedings of the Royal society. N° 47 et 48, 1841. 
London. 2 broch. in-8°. 
Osservazioni geologiche sulle Alpi marittime e sugli 
Apennini liquri de Angelo Sismonda. (Extrait des Mem. 
de l'Acad. R, des scienc. de Turin. Série IL. Tom. IV). 
Turin, 1841. Broch. in-4°. 
Revue zoologique, par la Société Cuvierienne: jour- 
nal mensuel, publié sous la direction de M. F.-E. Guérin- 
Méneville, 1841. N° 1 à 6. Janvier à juin 1841. Paris, 6 
broch. in-8°. 
Observations sur les Érotyles, par M. F.-W. Hope. 
(Extrait de la Revue zoolog. Avril, 1841). Paris, 1841. 
Broch. in-&v, 
