74 



BARRINGTON MOORE 



Vol. Ill, No. 1 



to 



^2 



<5> 





CC 



i-s- 





RED 

 -§.)i-PlNE 



t.is 



o 



JACK 



PIN EH 



CO 



1^ 



<-0 



PITCH 

 PINE- 









Fig. 4. Green weight of coniferous seedlings on unlimed soils, showing response 



to humus. 



Table 2. Green weight 



Si)ecies 



Soil 



Average green weight per plant, grams 



Sand 



Sand with 4% 

 humus by weight 



Humus 



Jack pine . 

 Pitch pine 

 Red pine. 



.167 



•31 

 .222 



.18 



•34 

 .228 



1.215 

 2.14 

 .607 



Pitch pine showed the greatest green weight, as well as the tallest height 

 growth, and had a slightly more uniform growth throughout the season (see 

 figs. I and 2) , This may be because the climate was best suited to pitch pine, 

 for it alone occurs naturally in the vicinity, or it may be merely a specific 

 character. 



