HYDROGEN-ION CONCENTRATION 



35 



in the accompanying chart. The H-ion concentration of the unknown 

 solution is that of the tint with which it matches in the series. 



It might be thought that this method would be inaccurate because of 

 the loss of carbon dioxide from the blood. By actual experiment, how- 

 ever, it has been found that, if the blood is collected with certain pre- 

 cautions, the error is negligible. The method is, therefore, a most useful 

 one clinically. 



The following table gives the hydrogen-ion concentration or true 

 reaction of the body fluids. 



(W. M. Clark and H. A. Lubs.) 



