THE GIRTH-INCREASE OF TREES. 103 
and 87 per cent. in the adult. The highest single records all 
took place in No. 2, and were 5 in April, 30 in May, 65 in 
June, 45 in July, 20 in August, and 5 in September. 
ULMUS MONTANA. 
No Wych Elm was under monthly observation in 1892-95, 
but I give the results in two thriving specimens for 1888—gr :— 
No. 93, 94.—ULMUS MONTANA. 
Girth in 
No. Apr. | May. | June. | July. | Aug. | Sept. oe a com Half soca at 
. Observation. 
93. 10 | 105 | 200 | 180 | 150 | 35 315 365 19°55 
94, 15 | 8 | 205 | 185 | 95 | 30 305 260 16°35 
| 
Total, | 25 | 195 | 405 c 245. | 65 | 620 625 | | 
| 
PERCENTAGE, 
9. | 15] 15 130 |2965| 23 | 5 | 465 | 58% as 
04, | 25 | 16 -+ 365 | 24) Wt Bb] 84 46 | 
| | 
Ls 15 | 32°5 | 255 | 20 5 | 495 | 505 = | 
The general result is that the two half-seasons are nearly 
equal. But taking details, No. 93, the more vigorous grower, 
although 94 is little inferiot to it, has a slight preference for the 
second half-season, while 94 has a somewhat greater preference 
for the first half. The difference is somewhat greater than it 
would otherwise have been owing to the peculiar results in 
1888, when the increase in the two trees was nearly equal in the 
first half, while in the second half that of 93 was just double 
that of 94. 
June was decidedly the best month in both; the proportions 
of May and August were fair, but those of April and September 
rather insignificant. 
The highest individual records were § in April, 30 in May, 65 
in June, 50 in July, 50 in August, and 15 in September, 
