A52 Bibliography. 
memoir contains impressions of six double tracks, alierona right and 
left. The slab from which the view is taken sures. thirty-four 
inches by twenty-one. The general character ae ane of the im- 
pressions and their arrangement are mentioned in the account in vol, 
ix of this Journal, above referred to 
4. Catalogue of Shells Ai at Panama, with Noees on. their 
Synonymy, Station and Geographical DaeirBittoned by C. B. Apams, 
from Annals of Lyceum of Nat. Hist. of N. Y., vol.v.) 334 pp. 
New. York, 1852.—This large volume sero a ph fim: catalogue 
of 516 species of Panama shells, their habitats as to depth, as far as 
ascertained, and a eamprehensiye synonymy of the fROUeE with de- 
species. ‘The number of. specimens of Mollusks collected at Panama 
by the author in his journey was 41,830; and of the 516 species 376 
were Gasteropods, 139 Acephala, and one a Brachiopod. The new 
species number nearly 160. The paper by Mr. R. Bland in this vol- 
ume renders it unnecessary to cite in this place from this very valuable 
work of Prof. Adams. Such a thorough canvassing of the species of 
a region, as is given by Prof. Adams, wherever he carries his researches, 
will tend rapidly to hasten our knowledge of the great principles in- 
volved in the present distribution of species over the globe. The plu- 
ral origin of species among the lower orders of animals is rendered 
more than probable by the investigations thus far made. We may 
however doubt the principle that all varieties thus originated. It is not 
through sraioee we can feel assured that we know the full extent of 
these ¢ 
oceedings of the American Association for the Advancement 
of ae 6th meeting, held at Albany, N. Y., August, 1851. xl, and 
411 pages, 8vo, Albany and Geese, 1852.—In vol. xii, p. 305, 
of this Journal, we have given a list of the papers read before the As- 
sociation at Alban ny. The present volume contains these papers either 
as abstracts or in full, as far as they were received by the Secretary. 
6. Elements of Natural patorcbie ; by W. H.C. Barrzert, LL. D., 
Prof. Nat. and Exper. Phil. in the U.S. és Acad. at West Point, 
including, II, Acoustics, III, Optics. 360 pp., 8vo. New York, 1852. 
A..S. Barnes & Co.—The Elements of ‘Natural Pullen ob rt ‘ 
cules, The author ee passes to the near of MATES a“ velocity of 
sound Psi different media, the interference of waves of sound, 
2s of musical tones and intervals, vibrations a F plates, strings, 
