10 

 ELECTEOTYPE MANIPULATIOIf : 



Being the Theory and Plain Instructions in the Art of Workir\g 



in Metals, by Precipitating them from their Solutions, through 



the agency of Galvanic or Voltaic Electricity. By Charles V. 



Walker, Hon. Secretary to the London Electrical Society, etc 



Illustrated by Wood-cuts. A New Edition, from the Twenty- 

 fifth London Edition. 12mo. 75 cts. 



PHOTOGEmC MAI^^PULATIOl^ : 



Containing the Theory and Plain Instructions in the Art of 

 Photography, or the Productions of Pictures through the Agency 

 of Light ; including Calotype, Chrysotype, Cyanotype, Chroma- 

 type, Energiatype, Anthotype, Amphitype, Daguerreotype, 

 Thermography, Electrical and Galvanic Impressions. By 

 Seorge Thomas Fisher, Jr., Assistant in the Laboratory of 

 the London Institution. Illustrated by wood-cuts. In one vo- 

 lume, 24mo., cloth. 62 cts. 



MATHEMATICS EOE PHACTICAL MEN : 



Being a Common-Place Book of Principles, Theorems, Rules, 

 and Tables, in various departments of Pure and Mixed Mathe- 

 matics, with their Applications; especially to the pursuits of 

 Surveyors, Architects, Mechanics, and Civil Engineers, with nu- 

 merous Engravings. By Olixthus Gregory, L. L. D. $1.50. 



Only lot men awake, and fix theii* eyes, one -while on the nature of thingf?, 

 another while on the application of them to the use and service of mankind. 

 — Lo7~d Bacon. 



EXAMINATIOIJS OF BHUGS, MEDICINES, CHE- 

 MICALS, &c. 



As to their Purity and Adulterations. By C. II. Peirce, M.D,, 

 Translator of "Stockhardt's Chemistry," Examiner of Medicines 

 for the Port of Boston, &c. &c. 12mo, cloth $1.25 



