Review of Alger's Phillips', and Shepard's Mineralogy. 333 

 from which we can easily deduce 



EI :EH::V; v. 



But we have shown that EH is greater than EI by „ 

 therefore V is greater than V by the same fraction V or 'in other 

 words, the velocity of the moon increases JT --^__- annually, 

 and our former assumption is thus proved to be correct. 



i 



873222900 s J 



Art. X. — Review of Alger's Phillips' Mineralogy, and Shep- 



ard's Treatise on Mineralogy.* 



The past six months have been remarkable in the history of 

 American mineralogy. In the April number of this Journal, we 

 noticed the first production of the season, by J. D. Dana, of 

 this place. Early in June last, Phillips's Mineralogy, by Fr. 

 Alger, made its appearance at Boston, and towards the latter 

 part of July, the second edition of Prof. C. U. Shepard's " Trea- 

 tise" left the New Haven press. 



Mr. Alger's work exhibits great labor in searching out the late 

 discoveries from foreign and American journals. The original 



^ 



■ ■ '■ ■ - - - ' ' — ' — •" ' ™""™~ — i^^— urn -^— ^— ^»n— ^— ^^^-* 



1. An Elementary Treatise on Mineralogy, comprising an Introduction to the 

 Science. By William Phillips, F. L. S., M. G. S. L., &c. &c. Fifth edition, 

 from the fourth London edition ; by Robert Allan : containing the latest discov- 

 ers in American and Foreign Mineralogy with numerous additions to the Intro- 

 duction ; by Francis Alger, Member of the American Academy of Arts and Sci- 

 ences, of the National Institute for the Promotion of Science, of the Boston Society 

 of Natural History, etc. 8vo, pp. 150 and 662. Boston, William D. Ticknor & Co. 

 1844. $3. 



2 - A Treatise on Mineralogy. By Charles Upham Shepard, M. D., Prof, of 

 Chemistry in the Medical College of South Carolina, &c. &c. Second edition. 



l2mo > pp. 168. New Haven, A. H. Maltby, 1844. 



Note.— As a portion of this edition is bound up with the descriptive part of the 

 fir st (1835) in two volumes, it may be supposed that a new edition of the entire 

 w ork has been prepared, particularly as the title on the back reads " Treatise on 

 Mineralogy, by C. U. Skcpard, second edition, 1844, price $1.50." Although it 

 m, ght appear to the author that the facts were obvious, still we think 

 a ct state of the case should have been mentioned. The following appears to be 



e au *hor's explanation on this point. 



"In giving the characters of the species, (p. 106 to the end,) I have appended 

 (within parentheses) to each, the most interesting information of various kinds, 

 w "ich has been brought forward since 1835, with a view to supply the principal 

 deficiency which the use of the treatise might occasion to such us wish to employ 

 ,l > in connection with my general work on descriptive mineralogy of that date."— 

 Adver. to the new edition of the Introduction, New Haven, June, 1844. 



Persons still desiring the two treatises can obtain them bound together as a sin- 

 S le volume. 



V ol. xlvii, No. 2.— July-Sept. 1844. 43 



that the ex- 





