THE GIRTH-INCREASE OF TREES. 93 
The half-yearly results in No. 20 show a sufficiently well 
marked preponderance of the second half, although it is less 
evident than in the other groups given in the Table, whether of 
young or old trees. __ 
The monthly amounts and proportions indicate that the species 
is rather late in beginning to grow, and that the increase is 
comparatively small in the first two months. The four adults of 
1884-87, indeed, have a fair proportion in April, but in May it is 
correspondingly small. In No. 20 June yields the highest 
increase, but it is not much above July. In the other sets it is 
the reverse, but the superiority of July is well marked only in the 
old trees. The united percentage of June and July is 58 in No. 
20; 66, 57, and 66 in the other sets. On the whole the species 
continued to increase in girth well on to the end of the season. 
The highest records in each month of No. 20 were 5 in April, 
30 in May, 50 in June, 45 in July, 35 in August, and 15 in 
September. Taking in the three sets of older observation pub- 
lished in my former Papers, the figures are but little raised 
except in July. The highest there are April 15, May 30, June 
55, July 60, August 40, and September 15. 
[QUERCUS ROBUR. 
