238 Prof. J. B. Farmer. On the Quantitative Differences in the 



Table IV. — Sixteen Birch Twigs from 14-year-old tree felled July, 1917. All 



are Lateral Branches. 



-A ge in 

 years. 



-A,rea in inclies 

 ( X 10') 



-A-bsolute vol. per 

 \ iiour. 



Specific vol. per 

 4 liour. 





9 •'79 



/ D 



4o 



o 



£i 



is DO 



Q '*X 



y o 



OD VJ 



Q 

 O 



oo 



±0 f5 





2 



4-72 



14-4 



47-0 



2 



6 '87 



22 "2 



48 "0 



3 



6-84 



22 50 



50-2 



3 



8-17 



21 -2 



400 



3 



4-42 



16-0 



56-0 



3 



3-23 



8-0 



38-5 



3 



3 -35 



13 -4 



64-0 



3 



5-20 



14-6 



43-5 



4 



6-20 



23 -8 



59-5 



3 



4-24 



10-8 



39-5 



3 



3-33 



10 -0 



47-0 



3 



3 -50 



13 -0 



57 -5 



3 



3-64 



9-4 



33-3 



1 74 '55 sq. ins. 

 1 ( X 10) 



= 4-81 cm. 



(actual size) 



230 -5 



-5 -47 -9... 

 4-81 



767 -5 

 average = 47 '9... 



Fig. 1. — Eesults of haphazard mixing of Birch laterals and terminals of young trees with branchesi 



of older trees. 



