344 UNIVERSITY OF COLORADO STUDIES 



that during the past eight years the test has been made in the same 

 way in the clinical laboratory makes our results most trustworthy. 



In deciding upon the clinical value of the Ehrlich diazo reaction 

 we can fairly discard the work of all investigators who have not per- 

 formed the test in accordance with the directions laid down by 

 Ehrlich, or who have not considered the pink foam as the important 

 factor in the test. In this list are included the names of Penzoldt, 

 Petri, von Jaksch, Munson and Oertel, and Edwards. The statistics 

 presented by numerous investigators who have performed the test 

 correctly are overwhelmingly convincing as to the value of this re- 

 action in the diagnosis and prognosis of typhoid fever, and the prog- 

 nosis of diseases such as pneumonia, diphtheria, septicaemia, and 

 especially tuberculosis. 



