396 



BOTANICAL GAZETTE 

 TABLE I 



[NOVEMBER 



Looking at the average gain per day, we see that in cutting 6 the 

 greatest increase occurred, while above and below the amoxint of 

 gain varied irregularly with the different cuttings. However, the 

 gain in the apical shoot was but slight. Comparing the results of 

 May 25 with those of June 3, it is evident that, with the excep- 

 tion of the apical shoot, the average daily increase at the latter 

 date was greater in every case than in the former. In other words, 

 the tree grew faster in diameter, with the exception of the terminal 

 shoot, during the last of May and the first of June than before that 

 time. It follows from the table that the rate of increase varies 

 considerably with the cutting and obeys no general law. The 

 data of June 15, howevej, are most interesting. There was a 

 decrease in the rate of growth between June 3 and June 15, with the 

 exception of the apical shoot. Here, on the contrary, the gain in 

 12 days was 15 times as great as that of all the diameter growth 

 previous to June 3. There was then a very marked increase in the 

 formation of the annual ring at this point as compared with the 

 gradual decrease in the remainder of the tree. Unfortimateiy, 

 however, data are not available bearing on the rate of elongation 

 of the apical shoot. It would appear, however, that its elongation 

 must have been very rapid up to June 3, so much so in fact that the 

 increase in the width of the annual ring cotdd not result. From 

 June 3 to June 15 the rate of elongation probably decreased appre- 



