vi Supplement to 
“ Nature,” 
April 28, 1923 

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Coblentz, W. W. Various Photo-Electrical Investiga- 
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Crewe, H. T., Edited by. The Practical Electrician’s 
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Faraday Society. The Generation and Utilisation 
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Grover, F. W. Tables for the Calculation of the 
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Haynes, F. H. The Amateurs’ Book of Wireless 
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Heerdt, J. ter. Overzicht van de Theorie en de 
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Pp. vii+324. (Utrecht en Nijmegen : 
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Chemistry 
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Fischer, H. Seifen und Eiweissstoffe, ihre kolloid- 
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(Dresden und Leipzig: T. Steinkopff, 1922.) ; 
Galarza, R. Quimica experimental (inorgdnica) : 
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colegios nacionales. Cr. 8vo. 14 Parte. Pp. 
(Rosario, Argentina; A, Alvarez, 1923.) * 
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