174 TRANSACTIONS OF THE SOCIETY OF PHYSICS, ETC. 



receut discoveries in regard to tbe cerebral system; M. Soret upon the 

 method employed by M. Becquerel for the study of the calorific spectre 

 by the aid of phosphorescent substances, and upon various physical 

 memoirs read before the French association at Lyons. Finally, M. 

 Marcet has addressed a letter to us from London, in regard to the 

 investigations of Tyndall upon the propagation of sound in the atmos- 

 phere. 



Publications of the society. — Volume XXIII, part 2, in which we pub- 

 lish this report, shows that the series of our memoirs continue in a 

 satisfactory manner. The society has no other resources for the main- 

 tenance of this publication than those furnished by its members and 

 the products of the sale or exchange of its volumes. The preceding 

 year the family of Edouard Claparede generouslj' aided us in publishing 

 his last and remarkable work. If this liberality were repeated we 

 would be able to give much more extended memoirs, illustrated with 

 many more plates, for happily scientific activity does not decrease 

 amonsr and around us. 



