New and Useful Books in 

 Related Fields 



The Effects of Ions in Colloidal Systems $2.50 



A study of an important problem by a world authority, 

 Dr. Leonor Michaelis. Treats Adsorption of Ions; Elec- 

 trical Double Layers; Properties of Charcoal; Charge, 

 Adsorption and Flocculation; Donnan Equilibrium; 

 Lyotropic Effect of Ions; Mixtures of Electrolytes. 



The Determination of Hydrogen Ions $5.00 



A treatise on the hydrogen electrode, indicator, and 

 supplementary methods of determining hydrogen ion 

 concentrations, with an indexed bibliography of two 

 thousand references on applications. An important con- 

 tribution. Second edition. With an indicator chart in 

 colors inserted. By W. Mansfield Clark. 



Hydrogen Ion Concentration of the Blood 



IN Health and Disease $2.00 



A summary of the most important facts presented in 

 concise form for the use of clinicians and workers in 

 clinical laboratories. By J. Harold Austin and Glenn 

 E. Cullen. 



THE WILLIAMS & WILKINS COMPANY 



Publishers of Scientific Books and Periodicals 

 BALTIMORE, U. S. A. 



