~ 
56 CHRISTISON—OBSERVATIONS ON 
topping of it by a neighbouring tree, although this cause could 
not have operated at first? Of the two very young trees, Nos. 
73, 80, growing near each other in the South border of the 
Arboretum, the first has proved inferior to the second, although 
of the same age, the rate of No. 73 having been ‘81 and of 
No. 80 1:19. That of No, 4,a somewhat older tree in the North 
border, was 1°21, when its career was interrupted by pruning, as 
that of the other two had been by transplantation. 
The range was moderate in them all, ‘60 to 1:10 in No. 73 ; 
‘95 to 1°35 in No. 80; and 1°05 to 1°40 in No. 4. 
ULMUS MONTANA.* 
* Erroneously named U. campestris in my former paper. 
ANNUAL INCREMENTS. 
Annual| Girth 
Total. Av. |at last. 
. | 1889, | 1890. | 1891. | 1892. 1 1893. | 1894. | 1895. | 1896. | 1897. 
| 
1°80 | 1°75 | 1°50 | 1°30 §. 1°70 | 1°60 | 2°05 | 1°75 | 1°35 § 16°55 | 1°65 | 30°75 
175 | 1:50 130 | "10 | -30 | °80 | 1:55 | 160 | 120 | 10°05 | 1:43 | 22°30 
wo 
oN 
No. in List. 
ian 
& a 
| 290 | 555 525 | 220 | . Po |... | 360 | 335 | 2°55 
In the Edinburgh city gardens the Wych Elm resists the 
deleterious influences of town life better than any other species. 
In the Botanic Garden there is no specimen of considerable size, 
and thus it happened that Sir Robert did not experiment on the 
species, and I have no records in the first decade. In the second 
the two healthy young trees, Nos. 93, 94, in the Arboretum have 
done remarkably well, the former yielding an annual rate of 1°65 
for ten years, the latter 1°43 for seven years, the other three 
years of its decade having been employed in making up the loss 
sustained by transplantation. Not one of the seventeen records 
falls to one inch. 
The range has been moderate, 1°30 to 2°05 in No. 93 and 1°15 
to 1°75 in No. 94, and there has been no marked depression, 
although both trees were almost at their lowest rate in 1897, the 
united increments being 2°55. The best year was 1895, with 
3°60, being an average of 1°80, but several other years were nearly 
as good, 
