123 



ner's press; there will then be no living tissue cells in 

 the juice. It is also the safest to store the tissue juice 

 in the refrigerator for a couple of days before using it. 

 The other method is to cultivate the epithelium on the 

 free surface of the coagulated plasnia-exlrnd medium. In 



Fig. 18. 



Experiment 1128 — 2. 13th passage of a pure culture of epithelium growing 



embedded in the clot. The new growth appears as solid processes and 



tubules. Stained with Azur II. X about 160. 



From The Journ. of Exp. Med. 1922, XXXVI, 285. 



the latter method the plasma and the tissue juice is mixed 

 up and allowed to coagulate before the tissue fragment is 

 brought to the medium. If a small piece of foreign tissue 



