502 



NA TURE 



[March 22, 1900 



This spectrum is of slightly larger dispersion than the normal 

 one, and may be brighter, although this will probably depend 

 on the particular grating in question. In the grating used this 

 is shown exceedingly clearly by the reproduction given with the 

 paper of the spectrum of iron photographed in the two spectra, 

 that given by the internal position being decidedly longer and 

 more intense than the normal spectrum. 



Dr. Rizzo investigated this disposition on account of being 

 unable to use the instrument as usually set up, but it is possible 

 that the fact of its being a practical arrangement may be of 

 interest to other workers with the concave grating. 



FORTHCOMING BOOKS OF SCIENCE. • 



Mr. Felix Alcan (Paris) promises : — " Mineralogie Agricole," 

 by Prof. Houdaille ; and " Manuel d'Histologie Pathologique," 

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Mr. Edward Arnold's list contains : — " A Manual of Ele- 

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Messrs. George Bell and Sons announce: — "The Compara- 

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Messrs. A. and C. Black's list includes: — "A Treatise on 

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Messrs. J. and A. Churchill's announcements are: — "An 

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The Clarendon Press will publish:—" The Structure and 

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NO. 1586, VOL. 61] 



In Messrs. J. M. Dent and Co.'s list we notice: — "The 

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Mr. Gustav Fischer calls attention to :— " Die Ohrenheil- 

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Messrs. Gay and Bird announce : — " Comparative Physiology 

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The announcements of Messrs. Charles Griffin and Co., 

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Messrs. Longmans and Co.'s list includes : — " Malaria, ac- 

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