AMERICAN JOURNAL OF SCIENCE. 



Just received, price 7s. 6d., No. 39. of 



THE AMERICAN JOURNAL OF SCIENCE AND ARTS; with 

 Six Plates, one coloured. 



Conducted by BENJAMIN SILLIMAN, M.D., &c. 

 And Professor of Chemistry, Mineralogy, &c. in Yale College. 



Also price Is. 3d., No. 8. of 

 THE AMERICAN MECHANICS' MAGAZINE. 



O. Rich, No. 12, Red Lion Square, Holborn. 



Just Published. 



ANEW ANALYTICAL SCALE OF EQUIVALENTS. Com- 

 prising, in portable compass, expressed in Analytical Symbols, clas- 

 sified for prompt reference, most of the Salts, Reagents and Precipitates 

 used in Analytical and Operative Chemistry : Multiples of the leading 

 Constituents, viz. Oxygen 1 to 12, Hydrogen 8 to 50, Carbon 2 to 10, 

 Nitrogen 1 to 5, for adjusting the Atomic Results of Organic Analyses ; 

 Silica 1 to 6, and Alumina 1 to 3, for those of Minerals ; and Water 1 to 

 25 for Crystallized Salts, Hydrates, &c. : all the Elementary Bodies : all 

 the principal Binary Oxides, Chlorides, Iodides, Bromides, Sulphurets, 

 &c. ; and the greater number of Acids, Mineral and Organic, both as 

 Anhydrous and Crystallized : forming a comprehensive Scale of Equi- 

 valents ; and a General Table of Atomic Weights, adjustable, by moving 

 the Slider, to the Oxygen or Hydrogen Standard. The Numbers de- 

 duced, chiefly, from comparison of the Tables of Thomson and Berzelius, 

 with the Experiments on which they were founded. 



By Mr. JOHN PRIDEAUX, Member of the Plymouth Institution. 



For Sale, price 8s., at Messrs. Newman, Regent Street: Messrs. 

 Knight, Foster Lane, London ; and Maclaghlan and Stewart, College 

 Street, Edinburgh. 



