American Journal of Geology, 6 1 



rican Continent. 8vo; with 14 plates, or lithographic 

 prints, in the 12 numbers. 1831, 1832. Price 3 dollars 

 and 50 cents a year, payable in advance. 



Nos. 1 1. and 12. of this journal have been shown us. No. 11. 

 contains, besides minor communications and extracts, the fol- 

 lowing original papers of importance : — " On mineral and 

 metallic Veins ; " " On the modus operandi of Phosphorus on 

 the living System, by J. R. Coxe, M.D," " Observations on 

 the anatomy of the Sloth, Bradypus tridactylus L., by R. 

 Harlan, M.D." This is a valuable contribution to zoology, 

 and is enounced in a manner which instances its author as 

 technically familiar with comparative anatomy. lie alludes 

 to Mr. Waterton's notices, in his Wanderings, on the habits 

 of this animal, and admits most of his conclusions ; and agrees 

 fully with Mr. Waterton, that the apparent anomalies in 

 structure, which this animal exhibits, are but so many in- 

 stances of a remarkable adaptation of formation to the crea- 

 ted tf&tittid habits of life. " I^&edifiW'df the Geo- 

 logical Society of Pennsylvania," and ■"' Meteorological 

 Observations made at Wilmington, Delaware, by Henry 

 Gibbons, M.D.," also deserve mention among the original 

 f&p£rs in the number. 3 ^ ' ]o *™jIov fanoi fffll 



No. 12. Its principal contents are as follows: — An in- 

 teresting letter, of nine pages, from J. J. Audubon to the 

 editor, dated Bulowville, Jan. 12. 1832: it is descriptive of a 

 tour in which Audubon was then engaged ; the scenes and 

 incidents noticed are. interesting. " Remarks on the article 

 contained in Silliman's Journal for April, 1832, entitled 'Mr. 

 Lea on the Naiades.' " In Silliman's Journal, it appears, 

 Mr. Lea's performance has been unduly eulogised; and the 

 present paper supplies a critical analysis of it, occupying 

 12 pages, in evidence that it deserves not the character 

 ascribed to it in the above Journal. The next article has also 

 reference to the same Journal, in which M'Miirtrie's trans- 

 lation of the Regne Animal has been highly praised. Nine 

 pages are devoted to the review of this translation, in the 

 course of which numerous instances of the translator's having 

 misunderstood the author are pointed out. The paper next 

 in interest is entitled A Synopsis of the Trilobites of North 

 America. This paper describes several species, and is illus- 

 trated by a lithographic print, exhibiting figures of ten of 

 them ; and is stated to be but the forerunner of a book on 

 the subject, which is nearly ready for the press, and, in illus- 

 tration of the species described in which, casts in plaster of 



Paris will be supplied by the author to purchasers, who will 

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