March 25, 1892.] 



SCIENCE. 



181 



ready been sold. The regular edition, in two voluuie?, will be 

 ready on the 26th. 



— J. B. Lippincott Co., Philadelphia, recently issued "The 

 Tannins," by Henry Trimble. Tlie author is professor of anal.s Il- 

 eal chemistry in the Philadelphia College of Pharmacy. It is now 

 about one hundred years since tannin first became recognized. as 

 a distinct substance. About twelve years ago the author com- 

 menced to collect the literature of the subject, especially that re- 

 ferring to the astringent value of certain tannin-bearing materials, 

 with the methods involved in their estimation. As is always the 

 case with one thoroughly interested in his subject, the work grew 

 on Professor Trimble's hands till he thought best to give to the pub- 

 lic a work on the general subject, with gallotannic acid, and an 

 index to the literature, leaving for a subsequent volume the re- 

 maining individual tannins. It has been the author's constant 

 endeavor to make the book more than a mere compilation, and 



the results of much of his own experience have, therefore, been 

 incorporated. It is the author's hope that the present publication 

 may Itrad others to aid in bringing together information on his 

 subject. 



— The American Book Company, New York, Cincinnati, and 

 Chicago, has recently issued a '-Laboratory Manual of Chemistry,'* 

 by James E. Armstrong and James H. Norton. Mr. Armstrong 

 is principal of Lake High School, Chicago; and Mr. Norton is 

 principal of Lake View High School of the same city. The pur- 

 pose of the manual is to aid the student in his laboratory work in 

 such experiments as he can conduct himself, the experimental 

 work to be supplemented by a course in some good text-book. We 

 do not recall any other manual for use in chemical work in school 

 laboratories which at all compares with the one now before u?, 

 and it seems to show that the interest in the best methods of sci- 

 entific training in schools is making great progress. 



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