THE GIRTH-INCREASE OF DECIDUOUS TREES. 4 
In the quinquennia the rate of the second was nearly three 
times that of the first, the aggregate results being 63.5 and 
182.8 mil., and the averages 12.7 and 36.6. 
THE TREES SEPARATELY. 
1. PYRUS ROTUNDIFOLIA. 
The recovery in the general appearance of the foliage was 
slow, and did not seem to be complete till 1905. There was no 
loss of branches, and the head of foliage is now large and dense. 
The stem is about 3 feet 7 inches in girth and 14 feet in height, 
and the total height of the tree is 39 feet. 
The rate of girth-increase was progressive on the whole, that 
of the second quinquennium being double that of the first, but it 
was irregular from year to year. The average for the last five 
years, 8°6 mil., or about a third of an inch, and the last year’s rate 
of 11 mil. must be low, if we may judge from another of the same 
species in the Rosarium of the Botanic Garden, which has a 
stem 14 feet in height, girthing 6 feet 3% inches (2015 mil.), 
and is perfectly symmetrical, and crowded with foliage, which 
has a circumference of 165 feet. 
2, PYRUS COMMUNIS. 
This tree has not done so well as the last, and although the 
foliage is now healthy and fairly abundant, it shows awkward 
gaps from the death of branches. The girth is now barely 
4 feet 1 inch and is only about ? inch more than eleven years 
ago. The stem is 12 feet high and the tree 44 feet. 
The average annual rates for the two quinquennia were 
2°28 and 3.3 mil., but there was great annual variation—from a 
loss of 3°8 in 1901 to a gain of 12:7 in 1904. The increase in 
1906 was only 5 mil. 
3. CRATAEGUS OXYACANTHA, var. PLENO FLORE 
RUBRO 
The progress of the foliage to a healthy condition was not 
much quicker in the two hawthorns than in the pears, but the 
girth-increase began to improve earlier and went further. 
