THE GIRTH-INCREASE OF TREES. 
ALNUS GLUTINOSA. 
61 
| Aiea ANNUAL INCREMENTS. ’ 
IR Girth 
ate, Se elses esos —————— Ann. 
1S] Ist wes LF EL oD 
|S |Pecade] 1geg, | 1889. | 1890. | 1891. | 1892. | 1893. | 1894. | 1896, | 1896, | 1897. ae 
cea 
|-88 85 | 1-20 | -€0 | 70| 65] -70| 0 | -75| -10| -05 | 595| -74 | 14-20 
Ee | | 85] -80| 0) -75| -30| -5 4] 300] -75 | 11°85 
The results in this species are also not very satisfactory. No. 
88 at first looked well, and in 1889 had an increase of 1°20, but 
fell off in appearance thereafter, with an increase never rising 
above "75 in the six next years. It was then transplanted. No. 
7 has never looked vigorous. The annual averages of the two, 
‘74 and °75, are almost identical, but cannot be regarded as 
representative of normal growth 
BETULA ALBA. 
4 Annual ANNUAL INCREMENTS. a, [ett 
5 ist Total. ae: ao 
- Decade} 189g. | 1889. | 1890. | 1891. | 1892. } 1893. | 1893. | 1895. | 1896. | 1897. 
1} O07 | 05 | 00} 20; 05{/ 057 10| -10/| 05 | 15 {| OO] 0-75; -07 | 56°80 
78 80 | 135 | 1-10 | -95 | 1-45 | 1-30 | 125 | trans|pl’d&| died | 8-20 | 1-17 | 19°65 
82 70 | -90 | 1°10 | -80 | 1°40 | cut |down | oes 4°00] 98 | 26°65 
wid 1°70 | 1-80 | 1-60 | 1:35 | -50 | +30 | 6-45| 1-61 | 20°20) 
The only Birch measured in the first decade, No, 1, was a 
transplant from the former Garden in 1822, and was for long a 
chief ornament of the present one. Previously to 1878 it had 
been measured for three years, and had an annual rate of 41, but 
in that year it dropped to ‘25, and possibly the tree was past its 
Prime. Then came the three winters so disastrous to girth- 
increase in general, when many twigs died, the girth-increase 
almost ceased, and at the end of the decade not half of the long 
weeping branches remained. In the second decade there was 
no rally of girth-increase, which in twenty y has onl 
amounted to an inch and a half, but there has’ been little further 
degeneration in appearance, and the tree, now nearly five feet in 
