Aug. IS, 1919 Effect of Removing Pulp from Camphor Seed 235 



has shown that the burning off of the young seedUngs occurred to a 

 greater or less degree throughout all the late winter and early spring 

 and that the burning off was by no means uniform in all the experimental 

 rows. It appears, therefore, that the curves given in figure 5 are not the 

 true curves of germination, but rather the curv^es of count. However, 

 the true curve of germination follows closely the curve of count with 

 some striking exceptions. As the season advanced a large number of 

 seeds germinated within a short period of time, and as the heat of the sun 

 became more intense a large number of seedlings were burned off. In 

 the case of eight of the trees the burning off of the seedlings between 

 counts reached a point where it included practically all the younger 

 seedlings just pushing up through the ground as well as some of the 

 more tender seedlings of the count previously recorded. Consequently 

 a drop occurred in the curv^e, which shows as an apparent decrease in the 

 percentage of germination. This explanation is further supported by 

 the fact that somewhat later in the spring, during more favorable weather 

 conditions, germination of more of the seed took place, as shown in Table 

 IV, which caused a rise in the curve of count, especially noticeable in the 

 curves for trees G, K, and P (fig. 5). 



In the case of parent tree A, no apparent falling off in the germination 

 of camphor seed is recorded in either the pulped or unpulped seeds; in 

 tree C no apparent falling off is recorded for the unpulped seed; and in 

 tree D no apparent falling off is recorded for the pulped seed. In the 

 case of these trees. A, C, and D, the burning off of the young seedlings 

 which occurred between observations never reached a stage where the 

 total number of seedlings burned ofi' was large enough to cause a decrease 

 to show in the count. For this reason the curve of count for trees A, 

 C, and D, as indicated in figure 5, probably closely coincides with the 

 true curve of germination for the seed from these trees. 



CAMPHOR SEEDLINGS BROUGHT TO TRANSPLANTING SIZE 



Of more economic importance than the number of seed that germinate 

 is the number of seedling camphor trees which can be brought to trans- 

 planting size. Out of 4,800 seeds planted as they came from the tree 

 only 508 seedlings reached a sufficient size for transplanting, whereas 

 from 4,675 seed planted after pulping 3,499 such seedlings were secured. 

 The increase therefore in the percentage of seedlings of transplanting 

 size from the pulped seed over those from the unpulped seed amounted 

 to approximately 600 per cent. 



The loss of seedlings due to the burning off by the hot sun is relatively 

 large and has a marked influence on the percentage of seedlings secured. 

 In this experiment 14.5 per cent of the total number of seedlings obtained 

 from the unpulped seed and 5.5 per cent of the seedlings from the pulped 

 seed were burned off. However, the total loss of seedlings from pulped 



