THE GIRTH-INCREASE OF TREES. 175 
I. ANNUAL RESUETS. 
A. General History of the Species separately. 
PINUS EXCELSA. 
3 | Girth | Girth 
& | Obser- | 1887. | 1888. | 1889, | 1890. | 1891. | 1892. | 1893. | 1894. | 1895. | 1896. Total, | A22- 
& | Obser : Av. laa oe 
¢ | vation. 
a 
Poe af 
2 | 2°60 ‘90 | °90 | 1°20 | 1:20 | 1°20 | 1°25 | 1°15 | ‘90 | 120 | 1-05 [10-95 / 1-09 | 14-90 
es 3:70 eee 1:00 | 1°30 | 1:00 1°38 | 1-00 1:25 | 130 | 1°40 | 9°60 1°20 | 14:50 
Two older trees of this species stood in the first decade on the 
former terrace in front of the hot-houses. No. 24, much damaged 
by frost in 1878, became stunted, and the rate of girth-increase 
was only o'24. In the second decade it declined to 0°18, and 
the tree when cut down in 1894 girthed only 34 inches. No. 26, 
taller and better proportioned, but rather scraggy, had a rate of 
0'50 in the first decade, and kept it up in the second, but was 
not thought worth transplanting when the terrace was removed. 
It attained a girth of 4o inches. 
Two infant trees, Nos. 2 and 3, were selected in 1887; but 
No. 3, choked by its neighbours, proved useless. Its rate was 
only 0°38. That of No. 2 was 1'09, the range being only ‘90 to 
1°25. No. 11, when an infant, had been transplanted to the 
“Triangle,” and quite recovered in 1889. It continued to thrive 
with a rate of 1°20 for eight years when in 1897 it was again 
_ transplanted to the Pinetum, west of the Rock Garden, from the 
effects of which it had not recovered in 1900. It had the mode- 
rate range of 1'00 to 1'40 during the eight years. 
PINUS LARICIO. 
In 1887 this was one of the largest pines in the Garden, with 
a girth of 5 feet 8 inches, and it had grown at the rate of 4! in 
the previous decade; in the next nine years the rate fell to 0°35, 
and in 1896 it was cut down, while still sightly enough, with a 
girth of 6 feet and a height of 60 feet. 
The other species of Pinus did so badly that they may be 
very briefly noticed. 
