310 
states that when a section of a gall containing plasmodium is 
placed under proper conditions, amoeboid bodies separate from the 
plasmodium in the course of two or three days. 
In the English specimens I observed that if a gall containing 
plasmodium is cut off and allowed to become dry, the plasmodium 
concentrates into compact masses and appears to pass into a resting 
condition. If sections are now cut and placed in slightly warm 
water, the resting masses of plasmodium gradually expand and 
assume the motile or streaming state. Eventually the plasmodium 
concentrates in the peripheral cells of the gall and from thence 
passes to its free surface, where it becomes resolyed into numerous 
minute, globose sporangia of a reddish-yellow colour and about 
1 mm. diameter. The sporangia contain numerous minute orange- 
yellow spores, 1:5 to 3 u in diameter. Traces of a capillitium are 
also present, mixed with the spores. Toumey has obtained the 
fruit on several occasions on galls from different districts. 
_ Crown-gall is considered a very serious disease in the United 
States. Many thousands of fruit trees have been killed by it when 
Seedlings are most susceptible to the disease. The galls appear 
h 
