56 
SEED DISPERSAL. 
according to my judgment, were from two to four years 
old. They were placed under glass in a dark sheet-iron 
dish and exposed to the sun. The extra heat caused the 
cones to open ; many seeds were obtained and sown, and 
in five days they began to come up, 95 per cent germinat- 
ing. From the same tree I selected at the same time 
older cones, which I believe to be from four to six years 
old at least. From these, 225 seeds were sown, 191 of 
which germinated — about 85 per cent. 
