THE GIRTH-INCREASE OF TREES. 87 
range is small. There was no increase on three occasions, and 
it fell to ‘o5 ten times, and to ‘10 twelve times. 
SPECIES WITH THE LARGEST PROPORTIONAL INCREASE IN AUGUST. 
| a 
| et Se 
1892, | 1898. | 1894, | 1895. | Total, AVF} 3 ¢ 
pee) Se 
nN 
Robinia Pseudacacia, 20 | 25 | 25 | 45 6 39 | 34:2 
Quercus rubra,... he a ... Noob} 25 30 50 1-05 | 35 | 26-3 
Salix gp ce ge eh ab | 98 ee ere 
25 | 35 | 30 | 120) -30 | 240 
Populus fastigiata, .... ...  .... | 30 
SPECIES WITH THE SMALLEST PROPORTIONAL INCREASE. 
Fraxinus excelsior, ... o. irae Ge a 5 10 : 30 | “OT | 62 
Acer Pseudoplatanus, oy ee 5 20 10 5 ‘BO | -12 | 97 | 
Senn quroiea. Ge ee 1 5 | 20 | 40] 10 | 10-1 | 
Quercus robur,.. 9... ss | 61] 6 | | OY OFINF | 
The variation in the seasonal proportion of the species in 
August, 62 to 34:2, is very great compared with June or July, 
and even exceeds that of May. An increase of half an inch is 
only attained four times, of which Sa/zr claims three, Quercus 
rubra being the other successful candidate. There were twenty- 
eight records between a quarter and half an inch, The maxi- 
mum record, ‘95, or nearly an inch, was by Saézx. 
SEPTEMBER. 
Aggregate Results, 20 Trees. 1892. | 1893. | 1894. | 1895, jAverage. 
_—— 
Total increase, 70 | 80} 110 | 1:85 | 111 
Percentage of seasonal increase, 29 32 5-0 9°0 5° 
82 
Number with no increase, 10 9 6 8 
The average annual increase of September, the last month of 
the growing season, is a little more than an inch, only a quarter 
