REST PERIOD STUDIES WITH SEEDS 



25 



dry out after harvesting was also planted, but none of them grew. 

 Unfortunately not enough species of immature seeds were used to be 

 able to obtain any conclusive results, but apparently from the two 

 species which grew, green seeds, if they germinate at all, will grow 

 very much more quickly than ripe seeds.. Also it is apparently true 

 that immature seeds of woody plants are easily killed if they are 

 allowed to become dry before planting. 



TABLE 10. COMPARISON OF GERMINATION IN SEEDS OF WOODY SPECIES, ONE 

 SET COLLECTED AND PLANTED WHILE GREEN OR IMMATURE AND THE 

 OTHER IMMEDIATELY AFTER RIPENING 



* No Germination. 



EXPERIMENTS IN TREATING SEEDS TO FORCE GROWTH, 

 WINTER OF 1912-13 



Seeds of Woody Plants. The results of planting seeds during the 

 seasons of 1911-12 seemed to show that seeds of woody plants have 

 a longer rest period, sprout more slowly, and show a lower percentage 

 of germination than herbaceous species. Practically all of the seeds 

 used during the experiments in forcing during the winter of 1912-13 

 were woody species. However, a few herbaceous species were used. 

 While a larger number of the woody species were employed, these were 

 not subjected to very many treatments. Only nine species of non- 

 woody forms were experimented with. These were each subjected to 

 about twenty different treatments. The treatments of the woody 

 species consisted of drying, soaking, etherizing, stratifying, and com- 

 binations of these treatments. 



