GERMINATION^ IN THE GREENHOUSE AND NURSERY 327 



Table 14. — Yellow Pine— Comparative Rapidity of Germination 

 GREENHOUSE TESTS, I913-1916 



Northern California Seed 



20 40 60 80 100 120 Rap. 



days days days days days days F. Xo. 



Average 3 22 48 84 97 100 61 19 



Maximum 11 49 yy 96 100 100 40 



Minimum o 5 32 74 93 100 70 



Southern California Seed 



Average 6 22 45 76 96 100 62 13 



Maximum 20 40 69 93 100 100 50 



Minimum o 3 12 51 85 100 79 



It will be noted that average values are equal up to the fortieth day, 

 after which the northern seed gradually pulls ahead. Maximum and 

 minimum values also indicate greater average rapidity for northern 

 seed. 



NURSERY TESTS, 1913-I916 



Northern California Seed 



20 40 60 80 100 T20 Rap. 

 days days days days days days F. No. 



Average i 14 53 84 97 100 59 19 



Maximum 4 31 76 93 100 100 44 



Minimum o 2 37 66 94 100 71 



Southern California Seed 



.\verage 8 18 42 75 95 100 62 13 



Maximum 26 52 79 96 100 100 39 



Minimum o 17 44 89 100 Si 



Here, also, northern seed is more rapid and shows less variation. In 

 comparing greenhouse and nursery variation for northern seed, it is 

 found that the rapidity is very nearly the same at the different periods, 

 especially from 80 days on. It may fairly be said for yellow pine thai 

 the tables are reasonably reliable. A warm spring will result in germi- 

 nation somewhat more rapid than the average figures and approaching 

 the maximum, while a cold spring will have the opposite effect. 



Table 15. — Jeffrey Pine — Comparative Rapidity of Germination 



GREENHOUSE TESTS, 1913-I916 



Northern California Seed 



20 40 60 80 100 120 Rap. 



days days days days days days F. Xo. 



Average 2 23 46 83 97 100 61 16 



Maximum 69 80 99 hk) 100 32 



Afinimuni i 12 58 98 100 70 



Southern California Seed 



Average 10 34 62 92 98 100 5-! 19 



Maximum 17 56 79 94 99 100 ^7 



Minimum 1 29 86 99 100 08 



