THE GIRTH-INCREASE OF TREES: gl 
a of Monthly Girth Increase in Twenty Young 
ectduous Trees for Four Years, 1892-1895. 
] 
z | April. May. | June. July. August. Sept. 
1892, - - 06 11°3 | B34 31°5 20°3 2°9 
1893, | 4-7 19:0 | 285 27°0 176 3-2 
1894, | 60 11:8 | 26°7 33:0 175 50 
1895, | 2-4 143 | 280 26°0 20°3 90 
Average, 34 41 | 29-2 29°4 18°9 50 
| 
AVERAGE OF THIRTY YOUNG Decipuous TREES FOR Five YEARS, 1887-1891.) 
Bee ws | 50 
average, as inthe four years April twice exceeded September, 
and May once exceeded August. The proportions of June and 
July are almost identical, and of course greatly exceed those of 
the other months, even August. When compared with the trees 
of 1887-91 as shown in the Table there isa close correspondence, 
the only great difference being in the April proportion, the 
month in which disproportion is almost inevitable. Stated 
roundly, April claims 31, of the annual girth-increase, May }, June 
and July not far from + each, August 4, and September 3. 
As to the variation or range in the months, it is, as might 
be expected, extreme in April, the amount of increase being 
nearly twelve times greater in the best year than in the 
Worst, whereas even in September the best is only three times 
greater than the worst. May follows next in the ratio of less 
than two to one, while in June, July, and August the variation is 
comparatively trifling. 
4. Order of precedence of the months in the amount of girth- 
increase-—The sequence in the case of the young trees of 1892-95 
is as follows: :—July 23°4 p.c., June 292, August 189, May 1411, 
September 5, April 3-4. This differs but little from the results 
in the thirty young trees of 1887-91, for, although the positions 
of June and July are reversed, the difference between the two 
months in both sets of observations is very trifling. The 
sequence and proportions for 1887-91 are:—June 31, July 30, 
August 20°5, May 12, September 5, April 1°5. 
