320 CHAPTER XXIV. 



made in distilled water, cold, and filtered. Pieces of tissue 

 (epidermis) are macerated in it for three to four hours at 

 about body temperature. 



552. KiiHNE's Trypsin Methods (see Unters. a. d. Phys. Inst. Vniv. 

 Heidelberg, i, 2, 1877, p. 219). Very complicated. 



553. GETKXELST'S Methods (see La Cellule, iii, 1887, p. 117, and v, 

 1889, p. 126; also Zeit.f. wiss. Mik., vii, i, 1890, p. 57). 



