326 LUTHER BURBANK 



recent experiments made at the Rockefeller 

 Institute in New York by Doctors Montrose W. 

 Burrows and Alexis Carrel. 



In the course of their extraordinary tests in 

 the growing of animal tissues in an artificial 

 medium, they discovered that such tissues might 

 retain their vitality and capacity for growth not 

 merely when cut from the living animal but 

 when they were taken from the tissues of an 

 animal recently killed. 



And if the body of an animal was placed in 

 cold storage from the moment of death, the 

 tissues were found to retain their vitality and 

 capacity for growth for many days, instead of 

 for an hour or so only, as would have been the 

 case had they not been placed in cold storage. 



Moreover, the growing tissues themselves, 

 which under proper conditions could be kept 

 alive for weeks and even months, could be placed 

 in cold storage at a freezing temperature and 

 kept there for days without interfering with 

 their subsequent capacity for growth. Yet, if the 

 slides containing these same tissues were kept for 

 half an hour outside the incubator in a room at 

 ordinary temperature, they would inevitably die. 



In Dr. Carrel's phrase freezing seemed to 

 "rest" the tissues and give them new powers of 

 growth. 



