THE GIRTH-INCREASE OF TREES. 85 
SPECIES WITH THE LARGEST PROPORTIONAL INCREASE IN JUNE. 
a 
1892. | 1893. | 1894, | 1895. | Total.| AYe-| § 3 
ge. ga 
wR 
Acer Pseudoplatanus, ..,_—... | “55 | 50 | 50 | 15/170] 42 | 403 
Tilia europeea, eee | 65 | 5K] 50 | 25 | 1°95 | 49 | 80-4 
Fraxinus excelsior, .. ...... | 55 | “45s| “40 | “45 185 | 46 | 38-1 
SPECIES WITH THE SMALLEST PROPORTIONAL INCREASE. 
_ 
on 
Robinia Pseudacacia, ne we] OOP Ss “60 | 15°9 
Salizsp, ..  .. 3 oa oe a Oe oe 275 | 69 | 20-0 
In June growth becomes well established, and the annual 
variations are much less than in the earlier months. e differ- 
ences in the proportional increase of the species appear to be 
mainly due to normal differences in the distribution of girth- 
increase over the growing season in the different species. For 
example, the increase is much more evenly spread over the 
months in Saé¢x than in Acer, so that the proportion of increase 
due to June is much less in the former. The highest single 
score was very nearly one inch in 1895 by Sadex. 
JULY. 
Aggregate Results, 20 Trees. 1892. | 1893, | 1894. | 1895. ree 
| 
Rotel inoreas, 0 a 760 | 665 | 715 | 585 | -669 | 
Percentage of seasonal increase, se 31°5 27°0 33°0 26°0 29°4 | 
The average annual increase is six inches and three-quarters, 
or the same as in June, and the range is similarly moderate. 
The records fall as low as ‘10 five times, and of these two were 
05, all in 1895, when, as appears from the Table, there was a 
great general depressicn in July. 
