96 CHRISTISON—OBSERVATIONS ON 
and the other examples of Quercus robur, but they are great 
enough. They appear to be chiefly due to an almost invariable 
and remarkable deficiency in June in the older trees, whereby 
the amount is actually much less than in May. But for this 
strange anomaly the half-seasons would be about equal, as in 
No. 15. Another difference is that the percentage of April is 
greater, and of September less, in the young tree than in the older 
ones, 
The highest individual records, including the three trees, were 
10 in April, 20 in May, 25 in June, 30 in July, 30 in August, and 
15 in April. 
No. 18.—QUERCUS RUBRA. 
Girth in 
Year. Apr. | May. | June.| July. | Aug. | Sept. dees 7 ss oe ere nde 
Observation. 
1890 10 20 40 15. {...6 30 60 
1891. 10 15 45 25 5 25 75 
1892 10 30 50 25 40 | 7% 
1893. 10 20 45 45 30 75 75 
1894 10 15 25 35 50 50 85 
Total, | 20 65 | 185 | 215 | 145 10 220 370 il 
PGs (04) 100 | 225 {86s 12864 17 37 °2 62°8 
The half-season results show a great preponderance in favour 
of the last, and this happened in every year of the five but one, 
when they were equal. The April proportion is small, but if the 
observations had been confined to the first three years it would 
have been nil, showing the necessity of a large number of years 
to give a fair average in the weak months of April and September, 
in which last month the percentage is even less. The proportion 
for August is high, higher than for June,and July is decidedly the 
best month. The record of 50 in August 1894 is very remark- 
able. It is very large for that month in any tree, and is the 
maximum of its year. 
