Hoir Cultures Are Started 



127 



Pig. 39. Two views of the surface of eambial cultures of Abies 

 pectinata after 8 days (below) and one month (above) in vitro. 

 (From Gautheret, E. J. 1935. Eecherches sur la culture des tissus 

 vegetaux. (These) 215, plate XV, 15.) 



