286 KNUDSON: CAMBIUM DEVELOPMENT IN AMERICAN LARCH 



In order to show more clearly the results obtained and to aid 

 in the interpretation the following two tables have been compiled 

 from the preceding. In the TABLE ix are presented for each of 

 the branches the average number of rows of xylem cells and the 

 average diameter increase of the xylem tissue for the entire lateral 

 branch. The averages are obtained from the figures for each 

 individual cutting. 



DIAGRAM in. Diameter increase of xylem in various parts of tree E on May 2 



TABLE IX 

 AVERAGE DIAMETER INCREASE OF XYLEM IN LATERAL BRANCHES 



Branch 



Average no. of rows of new 

 xylem cells 



Average diameter increase 

 of xylem 



O fJL 



O M 

 18 M 

 23 M 

 14.1 M 

 15-7 M 



4-5 M 



From the above table it is evident that the least growth 

 occurred in the top and basal branches and the greatest growth 



