898 



JOURNAL OF FORESTRY 



It will be noted in both cases that seed which is just mature is less 

 vigorous than after it has had a resting period of at least one year. 

 The same thing is evident in Table 3 where the total germination is 

 much less in the M age class for both lots of seed than in several suc- 

 ceeding age classes. 



The Pearson coefficient of correlation for both lots of seed again 

 shows no relation between age of seed and the percentage of survival 

 when based on total number of seed sown. 



In the case of the Humboldt seed for .ages M to M -f 6 r = .049 ± 25 

 and for the Monterey seed r = .104 d= 25. 



^j. z. 



7J/sAcyo -T'inf 'frrcfx^ of- ■^ar^iy/a/ of Seed/was /fo Jajj. 



/*lo„hr,J Sefi 



f/umtMf •S'rt^ 



Tnc/itaffJ bj ^raijiif- /me average 

 Mcltrrr^ Seri O'TJ % ffr fror 

 f/an,l,Mf - O. 14-'/. '■ ' 



The straight line averages (fig. 2) again show comparatively little 

 slope toi the line and in this case there is an indicated increase in sur- 

 vival with increasing age of cones as follows : 



Monterey seed 0.77 of one per cent per year 



Humboldt seed (M to M-|-6) 0.14 of one per cent per year 



Humboldt seed (all ages) 0.75 of one per cent per year 



If, however, the coefficient is worked out basing the percentage of 

 survival on the total number of seed germinating (as shown in 

 Table 3) instead of the number of seed sown entirely different results 



