THE GIRTH-INCREASE OF TREES. 75 
decrease in girth-increase is probably due to increasing age. In 
the second decade the maximum, 2°80, compares unfavourably 
with the 3°60 before the bad years, and 3:45 after them, of the 
first decade. The range in the first decade, 1°95 to 3°60, is great 
owing to the severe winters; in the second it is remarkably 
small, 2°05 to 280. That the Beeches were subject to minor 
depressions, in common with other species, in 1883, 1885, 1887, 
and 1895 is evident, but I have not been able to inquire into 
their causes, 
QUERCUS CERRIS. 
AGGREGATE GIRTH-INCREASE IN Two TURKEY OAKS FOR EIGHTEEN YEARS. 
1879, | 1880. | 1881. | 1882. | 1883. | 1884 | 1886. 1886, 180 | 
1°05 | 1°85 | 1°65 | 1°45 shia bee 145 | 1-45 
1878. 
First Decade, 
1895. | 1896. | 1897, 
1°05 | 4°50 | 1°15 
\ 
ge | 1989, | 1890. | 1891. | 1892. | 1893. | 1894. 
Second Decade, .. a a0 ‘75 | 1°35 | 1:10 | 1-40 | 1°50 | 1°30 
: ' 
Unfortunately these Turkey Oaks only came under observa- 
tion in the third year of the first decade, but the decided rally 
from 1'05 in that year to 1°85 in the next indicates that they 
shared in the general depression of the time. It is somewhat 
remarkable that they never again approached the standard of 
1881 nearer than 1°55. The only other startling event in their 
career was the great fall in 1889 to the minimum, ‘75, due 
apparently to some cause specially affecting the species, as few 
others showed any sign of depression then. On the whole, there 
has been a falling off in the amount of girth-increase with time, 
but not to a marked degree. 
The range was 1'05 to 1°85 in the first decade, and ‘75 to 
1°50 in the second. 
QUERCUS CONFERTA. 
AGGREGATE GIRTH-INCREASE OF THREE HUNGARY OAKS FOR FOURTEEN YEARS, 
1878. | 1879. isso. | 1881. | 1882 | 1983. | 1884. | 1885. | 1886, | 1887. 
360 5°15 5°25 5-40 5°06 48: 4°65 5 30 
1888. | 1889. | 1990. | 1891. | 1892 | 1893. | 189%. | 1896. | 1896. sage 
365 | 460 | 505 | 405 | 515 | €-00 . | | 
