84 CHRISTISON—OBSERVATIONS ON 
SPECIES WITH THE LARGEST PROPORTIONAL INCREASE IN MAY. 
= 
1892, | 1893. | 1894. | 1895. | Total.| 400" ie 
9) 
Betula alba, .. ...  ... ... | 30 | 50 | ‘85 | 25 |1-40] 85 | 217 
Fraxinusexcelsior, .. ...  ...| ‘20 | ‘80 | 20 | 25 | °95 | ‘24 | 195 
Prunus Padus, Se fa | 0 801 Ob 1 80} ee fas 
mii 6. Cw | 8H | LO OO 100 | tO | 188 
SPECIES WITH THE SMALLEST PROPORTIONAL INCREASE. 
Robinia Pseudacacia, nea 5 5 5 10 25 | °06 | 9°6 
Crategus Oxyacantha, ise ep oO ty 1B 5 10 40 | 10 | 10°2 
Ulmus campestris, ...00 6. tee 5 10 5 5 25 | 06 | 10°4 
Several species besides those in the Table showed a capacity 
for May growth by having an occasional good score. Acer 
Pseudoplatanus once had °35, Fagus and Tilia 30, and Pyrus 
communis 25. Betula, Prunus, and Salix alone reached half an 
inch, once each, and none of them exceeded it. 
JUNE. 
Aggregate Results, 20 Trees, 1892. | 1893. | 1894. | 1895, |Average. 
Total increase, ,.. ... ...  ..| 805 | 7:05 | 5:30 | 580 | 6°67 
Percentage of seasonal increase, w» | 33°4 28°5 26°7 28°0 29°1 
The average annual increase for June is six inches and three- 
quarters, or three times that of May, and the range is con- 
siderably less than in that month. There was no record so low as 
‘05, and only three of:10. Of the eighty records, fifty-three were 
above a quarter of an inch, and of these seventeen were half an 
inch or more, 
[TABLES. 
