578 Notices of Scientific WorTcs. [Oct., 



graphs of solar, stellar, and nebular lines, together with terrestrial 

 spectra for the sake of comparisons. 



As we remarked above, this book is a useful addition to our 

 scientific hterature ; the language is clear, and the reader is pre- 

 sented with a view of the subject derived from extensive Continental 

 investigations, as well as researches wliich have been carried out in 

 the United Kingdom. Indeed, Professor Eoscoe's intimate ac- 

 quaintance with foreign physicists occasionally leads him into the 

 error of crediting foreign workers at the expense of his own 

 countrymen. The book is not only valuable to men of science, but 

 cannot fail to be also of great interest for the educated pubhc. The 

 recent brilhant discoveries which have been made by the spectrum 

 into the constitution of the sun, dating from the solar echpse of 

 1868, show that the prism of Newton in the hands of his successors 

 is destined to form the basis of a method of analysis, embracing 

 not only the solar system, but the whole material universe. 



