2. 



' Bihliography. 



}f Chemistry for the use of Students; by Wm 



447 



ih - 



ORY, M.D. First American from the second London edition, by J. M* 

 Sanders, M.D., LL.D. 12mo, pp. 614. Cincinnati. 1851: H. VV. Der- 

 by & Co.— Dr. Gregory's outlines of organic chemistry, embracing the 

 views of Liebig was extensively read, by cbemisis in this country, at the 

 time of its publication, as the most compendious view of the condi- 

 tion of organic chemistry at that time accessible in the English tongue. 

 That \Mork is here reproduced by its author in an improved form and in 

 connection with the inorganic chemistry now added, forms a very conven- 

 ient and useful book, both for the student and teacher. Dr. Sanders's edi- 

 tion is a reprint from the London issue of 1847, very neatly done and with 

 general accuracy. The peculiarity of Dr. Gregory's work compared with 

 xnost chemical treatises in our lanfrua^e, is the omission of all reference 

 to the general powers of matter commonly called the ' imponderables. 

 The book is strictly what its title implies, and the student is supposed 

 to derive his knowledge o^ physics as he does his mathematics and 

 zoology entirely from other sources. Undoubtedly this is quite the cor- 

 rect course for the teacher of chemistry, and coincides, probably, with 

 the sentiments of most lecturers on this subject. But unfortunately, and 

 especially in America, it is rarely, indeed never, safe in a mixed class 

 such as compose the medical schools In this country, to presume on the 

 possession of such physical knowledge as is commonly imparted in 

 the preliminary lectures of a chemical course- In fact^ heat is a sub- 

 ject so closely connected with chemistry, and so dependent on a knowl- 

 edge of molecular chemistry for its elucidation, that it is difficult to 

 present either subject disconnected from the other. Nevertheless we 

 are happy to have so good a book as Dr. Gregory's, accessible to chem- 

 ical students in America, and have no doubt that it will be very useful 

 and acceptable. 



3. Catalogue of Shells contained in the collection of Dr, John C. 

 Jay, Fourth edition, 4to. Dec, 1850.— The extensive collection of Dr. 

 Jay, and his equally extensive conchological library, have for many 

 years been well known to those who have inade this science their special 

 study ; and they unitedly present advantages, which as yet are furnish- 

 ed by no public institution in our country. 



The catalogue of a collection which M. Deshayes has declared 

 "would, even in Europe, be considered one of the first rank," must 

 possess interest to every student of natural history. The new and en- 

 larged edition before us, is the largest printed Catalogue of recent 

 shells ever published, enumerating about eleven thousand well marked 

 varieties, and comprehending at least seven thousand well establshed 

 species. 



The value of the work however, is imperfectly indicated by its un- 

 assuming title, for it has far other merits than those of a mere catalogue. 

 To every species is added not only its authorship and habitat, but also 



a com 



figures 



plete synonymy, with references to all the good descriptions and 

 3 extant. These references have all been carefully verified, which 

 alone is a work of great labor, as they number about eighteen thousand. 

 Every synonvme of any species (whether or not generally adopted) is 

 found in its proper alphabetical place, followed by a reference to its re- 

 ceived name. For instance, the student who is in doubt about Ildix 



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