Moore : The study of winter buds 



125 



In the buds oi Popuhis tr^emidoides the leaves, from five to nine 

 in number, are very small but comparatively well formed. The 

 number of nodes found on the growth of a given season varies 



mm. 

 40 



32 















1 

 1 



24 — j 



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i 



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1 



1 

 1 













- 









h 



b 



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16 

















A 





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V 





4 







4 













1 1 









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Figure A. Ulmtis americana. Curves of growth of the buds in length and 



diameter.' 



from six to twelve. A growth of six nodes may follow one of 

 six, ten, or twelve nodes and vice versa. This irregularity in the 

 amount of growth occurs during different seasons or in the same 



