104 CHRISTISON—ORBSERVATIONS ON 
ULMUS CAMPESTRIS. 
Girth in 
Year. Apr. | May. | June.| July. | Aug. | Sept. ela aoe belt a) = 
Observation. 
1892. 5 25 20 25 30 45 
1893. 5 10 20 25 35 25 
1894, 5 5 15 15 5 10 25 30 
1895. 5 20 10 | 10 5 25 25 
Total, | 10 25 | 80 70 40 15 115 125 
| i 
| 
P.C, - | 4:2 | 10°4 | 33°3 | 29°2 | 166 | 6:3 47°9 52°1 12 
This species does not attain perfection in Scotland, as is 
indicated by the low rate of increase, only from half to three- 
quarters of an inch annually in this specimen. 
The half-seasons 
are nearly equal, and June is the best month, but in no month 
is there a better single record than a quarter of an inch. 
SALIX SP. 
| Girth in 
Year. Apr. | May. | June.| July. | Aug. | Sept, = Half /2nd Half ae at 
Observation. 
1892. 35 80 65 45 20 115 130 | 
1893. 15 45 60 65 75 15 120 155 | 
1894, 25 30 40 70 75 25 95 170 | 
1895. 5 50 95 85 95 70 150 250 
1896 25 55 55 75 65 25 135 165 
1897. 35 15 70 90 30 50 190 
Total, | 70 | 250 | 345 | 430 | 445 | 185 665 1060 
P.Cc. -| 40 (145 | 20. | 25 | 258 1107 | 385 61°5 23 
THE SAME TREE WHEN YOUNGER, 1888-91. 
8 
P.O. - | 1-0 Bs m8 (2s (29 | 10 
+ 
oe 
