388 



Studies on So-Called Protective Ferments [April-July. 



fumishes the basis of diagnosis, but undoubtedly this may be a 

 source of many errors. A modification was offered therefore by 

 Schlimpert, which removes this source of error by subjecting the 

 serum to dialysis prior to applications of the main test, using sub- 

 sequently such serum deprived of its dialysable material for the 

 digestion with placenta.^ 



Our own study suggests another possible modification of the pro- 

 cedure of the Abderhalden test, which would take advantage of the 

 property of the substratum of being sensitized by a specific serum 

 so as later to give up dialysable substances when put in contact with 



3 Schlimpert and Issel: Münch. med. Woch., 1913, no. 32, p. 1758; also Ab- 

 derhalden and Wildermuth: Ibid., 1914, no. 16, p. 862. 



* In all cases " washed substratum " Stands for the substratum acted upon by 

 the specific serum at low temperatures, centrifuged, separated from the serum, 

 and washed in water. 



