THE GIRTH-INCREASE OF TREES. er si: 
permanently diminished after the three bad seasons ; that two, 
Cedrus Deodara and Taxus baccata, were affected, but gat perma- 
nently ; and that two, Cedrus africana and Pinus austriaca, 
were unaffected. 
In the remarkable and unaccountable second depression of 
1883, in which the Deciduous trees were nearly or quite 
unaffected, all the deodars (4), all the sequoias (4), and all the 
other pinacez except the yew had a diminished increase. 
Unfortunately, as most of the trees in this list completely 
failed early in the second decade, it is not in my power to give 
a Table of comparative results for the same trees in the two 
periods. The most I can do is to give the results of a new set, 
including a few of the old ones, in Table IX., comprising 17 trees 
of ten species. 
Here the range proves to be actually greater than in the set 
of the first decade, being no less than from 6°85 to 12°30. This 
depends upon an abnormally high ratio in 1893 and an abnor- 
mally low one in 1897. Withdrawing these the range for the 
remaining eight years is reduced to from 7°70 to 10°60. 
To check these results as far as possible, 1 give in Table X. a 
larger number of trees, including some additional species, treated 
in the same way, for the five years 1889-93. Here eleven species 
and twenty-six trees are dealt with. The range is from 7°45 to 
980, and on the whole the fluctuations agree with those in the 
corresponding years in Table IX., 1893 in particular being 
decidedly the best year in both. 
I have also found it possible to deal with 12 species and 23 
trees for the eight years 1889-96, in Table XI. Here the range 
is from 10°20 to 13°00, and the agreement with the fluctuations 
in Table IX. is pretty close. The decided maximum is again in 
- 1893, and the only marked difference is the comparatively small 
proportion of 1889 in Table IX., which, however, was almost 
entirely due to a single tree, Adies Lowiana, whose increase in 
that year fell 1°25 below that of 1888. 
In Table IX. the remarkable fall from 10°60 in 1896 to 6°85 in 
1897 was due to some cause which affected all the species with 
the exception of Cedrus atlantica, but this exception was more 
apparent than real, as, in fact, it had already fallen the previous 
year from 1°10 to ‘50, the figure repeated in 1897. 
