GERMINATION IN THE GREENHOUSE AND NURSERY 323 



Table 5. — Yellow Pine — Effect of Age on Seed 

 Southern California Seed 



G. N. 



Age G., N.. 



C. T. 120 days 120 days C. T. C. T. No. 



New 68. s 62 64 90 93 i 



1 year 84 15 11 . . . . 2 



2 years 82 54 38 65 46 2 



3 years 78 54 43 69 55 3 



4 years 79 43 39 55 49 4 



Average 81 46 39 57 48 13 



I have next tabulated a series of tests on seed of yellow pine 4 and 5 

 years old, which was retested in 19 16-17. The individual tests are 

 parallel, so as to show the remarkably consistent values given. Judg- 

 ing from these figures, all of which are for northern California seed, 

 yellow pine retains its vitality for five years. 



Table 6. — Tests on Seed of Yellow Pine 4 and 5 Years Old 



_ Collected Test, 1912-1913 Test, 1916 



(per cent) (per cent) 



35 1911 1912,59 67 



43 1911 1912,59 60 



loi 1912 1913,83.5 76 



103 I9I2 1913,64.5 72.5 



106 I9I2 1913,80 75.5 



107 1912 1913,73 75-5 



108 1912 1913,73-5 74 



122 1912 1913,80 78.5 



Incense cedar, as may be seen in the following table, behaves in an 

 entirely different manner. Starting with a germination of but 40 per 

 cent of cutting test, this falls to 33 per cent when one year old and 1 1 

 per cent when two years old, with practically no germination when 

 three years old. Certainly seed of this species should be collected fresh 

 every year. 



Table 7. — Incense Cedar — Effect of Age on Seed 



G. N. G. 



^^ C. T. G. N. C. T. C. T. N. No. 



New 67 27 28 40 41 104 28 



1 year 65 23 20 35 30 84 20 



2 years 67 94 16 7 47 7 



3 years No germination. 



4 years No germination. 



NUMBER OF SEED PER POUND 



With the prospective elimination of seed testing in this district, it is 

 important to have average figures for the various species. These are 

 given below. 



