134 



THE POPULAR SCIENCE MONTHLY. 



Chemical Equilibrium the Result of the 

 Dissipation of Energy. By G. D. Live- 

 ing, M. A., F. R. S. New York : Scrib- 

 ner & Welford. 



This essay presents the substance of a 

 course of lectures delivered by the author 

 iu the University of Cambridge. The doc- 

 trine of the dissipation of energy is, that 

 " there is a universal tendency in nature for 

 energy to take such forms and to be so dis- 

 tributed that it is not available to do me- 

 chanical work." This theory is here con- 

 sidered in a form especially adapted to the 

 problems of chemistry, and will prove of in- 

 terest to students of chemical philosophy. 



Moisture and Dryness ; or, the Analysis 

 of Atmospheric Humidities in the 

 United States. By Charles Denison, 

 A. M., M. D. Chicago : Band, McNally 

 & Co. Pp. 30, with~Charts. Price, $1. 



An essay read before the American 

 Climatological Association, and reprinted 

 from " The New York Medical Journal " 

 for September, 1884. The author takes the 

 position that " an actually small amount of 

 atmospheric moisture is the most important 

 element in the best climates for phthisis." 

 The causes affecting dryness, i. e., temper- 

 ature, altitude, the seasons, etc., are con- 

 sidered ; tables of Signal-Service stations in 

 the United States, rated in order of dryness, 

 are given ; and, finally, the physical effects 

 of dryness are discussed. 



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