98 CHRISTISON—OBSERVATIONS ON 
rubra. As tothe first point, the following remarks occur in a 
previous Paper :—* 
“] have made a separate study of this genus, as there seems 
to be a tendency in it to early vigour, followed by a period of 
slower growth. This is seen most unequivocally in the three 
Turkey Oaks, in all of which the June percentage is much 
exceeded by that of May on the one side and July on the other, 
No. i > |g | & || No. 7 Bl ee 
ee ea 8 ee 
63°} QO. \Cerris 5 [°3). | 28°117 ol ye O. obese 20°5 | 22°5 | 39 
43 me ote 20 |11 37 || 12 ee & 24 7 |41 
10*, a — Es 02-1 -6°5 | 36 2 53 a Ve tee fis Pao 
70 5 25 |125|16 {38 
Average .| 15 | 23 |11°5| 34 
1 11 |18 | 42 
* At Craigiehall. 
Average . | 2°3 | 17-7) 158 | 40°7 
40 | Q. conferta. | 8 6:5 |20 | 35°5 
54 a 19 9 | 29°5 | 34 
e ~|9 418 | 22°5 | 34 
& 
44 | Q. palustris | 10 | 18 | 16 | 41 
Average 8°7 | 9°5 |26 | 34:5] 61] Q rubra .| 2 | 15 | 20 | 39 
the general average of the three for from four to five years being 
23 for May, 11°5, or exactly half, for June, and 34 for July. In 
the three Hungary Oaks, the most vigorous growérs in early 
spring of all my deciduous trees, the same tendency is shown, 
but at an earlier stage and in a considerably less degree, the 
general proportions being 87 for May and 9'5 for June. The 
general average of the five British Oaks is 17°7 for May and 15°3 
for June, in strong contrast with the proportions for thirty trees 
in mass, which are 12 for May and 31 for June. In Q. palustrts, 
not a reliable specimen, however, June is slightly below May. 
In Q. rubra there is no actual inferiority, yet the tendency to it 
is probably shown by its May increase being one-third above 
that of the general average of trees, and the June increase one- 
- third below it. 
* Trans. and Proc. Bot. Soc., Ed., March 1892, p. 314. 
