326 JOURNAL OF FORESTRY 



greenhouse and nursery or between germination and cutting test. The 

 only value of the work done is to show that results of a test on an in- 

 dividual lot of seed, which because of slow germination are not avail- 

 able till after the seed is needed, are worthless except as a very general 

 indication of quality. 



No tables are presented, since they would have no practical value. 



INCENSE CEDAR 



The behavior of this species is extremely variable, and general aver- 

 ages must be used cautiously because of the wide difference between 

 parallel tests of the same lot of seed. For example, in 1916 three tests 

 of the same lot gave 12 per cent, 15.5 per cent, and 23.5 per cent final 

 germination respectively, two tests of another lot gave 3 per cent and 

 II per cent, and others showed just as wide a range of inconsistency. 



New seed, with equal greenhouse and nursery germination, averag- 

 ing 40 per cent of cutting-test values, is the most reliable, and this 

 figure may be accepted. 



RAPIDITY OF GERMINATION 



This is best expressed as a percentage figure derived thus : 



Total germ., 120 days. 

 Germ, at 10, 20, 30, etc., days. 



It is found that average figures for different years vary tremen- 

 dously, undoubtedly because of the varying temperatures. In general, 

 a cold, late spring delays nursery germination just as cloudy weather 

 with low temperature does on the greenhouse tests. The specific effect 

 of different temperatures on rapidity is, however, unknown. We can 

 fairly average all years to secure the difference in rapidity between 

 northern and southern seed and between old and new seed, with the 

 clear understanding that the average values do not necessarily apply 

 to a spe'cific year. 



Without knowing the effect of dift'erent temperatures, it is impos- 

 sible to compare one year with another, so that at best the values ob- 

 tained simply indicate comparative, not absolute, rapidity. 



It is important to know the average rapidity of germination, since 

 seed which germinate after about July i (or 80 to 90 days after sow- 

 ing) produce small, weak plants unsuitable for transplanting. If, for 

 instance, only 80 per cent of the total germination can be expected in 

 80 days, allowance must be made for this. 



