SCIENCE. 



The Elements of Chemical Arithmetic, 



with a Short System of Elementary Qualitative Analysis. By J. MILNOR COIT, 

 Master in St. Paul's School, Concord, N. H. 95 pages. Cloth. Price by mail, 

 55 cents. Introduction price, 50 cents. 



THIS manual is divided into two parts. Part I. contains the more 

 important rules and principles of Stoichiometry, put in a very 

 simple way to suit the comprehension of the average student. These 

 rules and principles find application in a series of carefully selected 

 problems which follow. Part II. contains an elementary system of 

 qualitative analysis intended for beginners. The most available and 

 satisfactory tests for the more important metals and acids are given 

 with simple tables of separation. Besides these are some carefully 

 compiled tables for reference. The book will be found valuable as a 

 companion for some regular text of descriptive chemistry or where it 

 is desired to give an elementary course in practical chemistry. It 

 has just been carefully revised and some valuable tables added. 



T. H. Norton, Prof, of Chemistry, 

 Univ. of Cincinnati, O. : It is admirably 

 written, and well adapted to supplement the 

 ordinary descriptive text-book or series of 

 lectures preparatory to scientific courses. 



Robert Peter, Prof, of Chemistry, 

 Kentucky State Univ., Lexington: I 

 can recommend it as a good, compen- 

 dious, and cheap guide for Laboratory 

 practice in Qualitative Analysis. 



Modern Petrography. 



An account of the Application of the Microscope to the Study of Geology, by 

 GEORGE HUNTINGTON WILLIAMS, of the Johns Hopkins University. Paper. 

 35 pages. Retail price, 1:5 cents. 



IVES a charming account of the development and progress of 

 v_J the new science ; adds a description of the marvellous results 

 obtained by Fouque" and Michel Levy in the artificial reproduction of 

 volcanic rocks ; a consideration of the relation of microscopical 

 petrography to the allied sciences ; a bibliography of petrographical 

 literature, and careful directions il on the preparation of rock-sections, 

 and on the manufacture of petrographical apparatus," etc. 



The Microscope : This book gives 

 an excellent introduction to the study of 

 microscopy. 



American Microscopical Journal, 



Washington: A satisfactory little book 

 admirably presenting the subject. 



