JOURNAL OF FORKSTRY, XV, NO. 2. 



PLATE I 



Fig. 1.— 'II , •: .-: lii- K.Mi .,.. ^m;i!> ,. ,. . . • .;i 



sterilizing slciIIkiIs, m pn-UKin for use and weighted down wiin serap inm. 

 Note steam pipe at left hand side, through which steam is conducted from 

 the traction engine. 



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f 



X > 





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Fig. 2. — Jack pine seedlings, showing the relative size of the seedlings that 

 grew in each of the experimental beds. The lower row of seedlings are 

 individuals taken from the groups in the upper row. The cord indicates 

 the approximate ground line. 



