Aug. 15. 1919 Effect of Removing Pulp from Camphor Seed 



227 



figure I , which shows not only 

 the increased germination 

 when the pulp is removed 

 but the variation in germi- 

 nation of seed secured under 

 varying conditions. The 

 seed planted on December i, 

 1 91 6, which was picked from 

 parent tree A, was first-class 

 in every respect. On Janu- 

 ary 6, i9i7,aquantity of seed 

 was planted that was picked 

 up from the ground under the 

 same tree, and on February 

 6 frozen seed from this tree 

 was secured and planted. In 

 every instance the removal 

 of the pulp before planting 

 greatly increased the germi- 

 nation. 



The percentage of germina- 

 tion of the seed picked up 

 from the ground is much less 

 than that of seed picked from 

 the tree (fig. i ) . This differ- 

 ence in germination was an- 

 ticipated and was due in 

 great part at least to defec- 

 tive seeds which fell from the 

 tree, in other words, those 

 which are considered as 

 " drops. ' ' However, even the 

 germination of these "drops" 

 increased by 16.4 per cent 

 when the pulp was removed. 

 Seed picked from the tree af- 

 ter a severe freeze germinated 

 remarkably well, especially 

 when the pulp was removed. 

 By soaking these frozen seeds 

 in water at a temperature of 

 approximately 25° C. for 18 

 hours a rather remarkable 

 result was obtained. The 



e-^ 



GO 



x5-s5- 



so 



^s 



t 



«?o 



/•s 



/o 



05 h 



Oote_of_ P/anti'n^r 



,5l 





Fig. I. — Diagram showing percentage of geniiination of 

 camphor seed secured from parent tree A imder varying 

 conditions. 



