106 CHRISTISON—OBSERVATIONS ON 
There is a substantial agreement in the main facts between 
No. 9 and the two of the earlier period, all of much the same 
age. The main increase is thrown into the second half-season 
very decidedly in No. 9, but still more so in the others, and July 
is the best month, but only to a trifling degree above August in 
the latter. Indeed, the percentage of 33 in August with them is 
almost unprecedentedly high ; Rodznza alone slightly exceeds it, 
and no other species comes near it. 
The best individual records are April 5, May 20, June 55, July 
65, August 50, September Io. 
No. 7——ALNUS GLUTINOSA. 
Girth in 
Year. Apr. | May. | June.) July. | Aug. | Sept. nbc oe — a 
bservation. 
1892 10 30 20 20 5 40 45 
1893 5 15 15 30 15 35 45 
1894 15 25 20 15 45 
1895. 5 15 15 20 15 35 35 
Total, 10 40 75 95 70 5 125 170 
P.C. | 8-4 | 185 | 25-3 | 32-2 | 24:0 | 16] 42:2 | 57-8 11 
; ONE YOUNG TREE, 1887-91. 
PG. | 1 | 11 | 38 33 16 1 | 50 | 50 | 14 
This species is not satisfactorily made out. No. 7 gives a 
decided superiority to the second half-season, while the half- 
seasons are equal in the other tree. Both, but particularly the 
latter, were erratic in their conduct, and it is not safe to draw any 
conclusions as to the monthly distribution of the species. 
The highest records were April 5, May 20, June 45, July 40 
August 25, September 5. 3 : 
