PHYSICAL SCIENCE. 29 



follow directions imperfectly understood, may readily comprehend 

 the meaning of each step, and be able to illustrate the practice by the 

 theory. Besides all necessary charts and tables, the work contains 

 a large number of skeleton forms for working out cases in 



practice. 



Roscoe. Works by HENRY E. ROSCOE, F.R.S., Professor of 

 Chemistry in Owens College, Manchester : 



LESSONS IN ELEMENTARY CHEMISTRY, INORGANIC 

 AND ORGANIC. With numerous Illustrations and Chromo- 

 litho of the Solar Spectrum, and of the Alkalies and Alkaline 

 Earths. New Edition. Thirty-first Thousand. iSmo. cloth. 

 4J. 6d. 



It has been the endeavour of the author to arrange the most important 

 facts and principles of Modern Chemistry in a plain but concise 

 and scientific form, suited to the present requirements of elementary 

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 questions upon the lessons have been added. The metric system of 

 weights and measures, and the centigrade thermometric scale, are 

 used throughout this work. The new edition, besides new wood- 

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 most important of the latest discoveries. " We unhesitatingly pro- 

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 Medical Times. 



SPECTRUM ANALYSIS. Six Lectures, with Appendices, En- 

 gravings, Maps, and Chromolithographs. Royal 8vo. 2is. 



A Second Edition of these popular Lectures, containing all the most 

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 ' ' The lectures themselves furnish a most admirable elementary 

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