q 
94 CHRISTISON—OBSERVATIONS ON 
No. 10.—QUERCUS KOBUR. 
Girth in 
Year. Apr. | May. |June.| July.) Aug. | Sept. i emeand naan oe 
ibservations. 
1892 15 30 30 15 45 45 
1898. | 10 | 15 | 20 | 20 | 10 45 | 30 
184. | 10 | 10 | 20 | 2 | 5 40 25 
1895. 5 10 15 5 0 30 5 
Total, | 25 50 85 75 30 160 105 13 
PO. = 1 O84 ASS e241 | 28 Bf 60°3 | 39°7 
Four Youne Oaks, 1887-91. 
P.C. | 15 [ws ars | ee ae 4°5 | 34°5 | 65°5 |13, 10, 8, 8 
OLD OAK (CRAIGIEHALL), 1884-87. 
24 7 
aia). | |e | 80 
The results for the half-seasons in No. 10 are completely at 
variance with those for the other four young trees and for the old 
oak at Craigiehall. The incidence of the half-seasonal growths 
is greatly in favour of the first half in No. 10, and as much in 
favour of the second half in the others. No. Io, also, in place of 
agreeing with the young trees in having a very small April 
growth and a substantial September growth, corresponds with 
the old tree in having a large April proportion and no increase 
in September at all. 
The difference may be partly explained by the manifestly 
increasing and abnormal deficit in No. 1o in the second half- 
season, which in the fourth year fell almost to zero. The 
uniformity in the records of the other four young trees tends to 
prove that their results are normal on the whole. Ofthe eighteen 
observations thirteen yield a great preponderance in the second 
half; in two the half-seasons are equal; and the three in which the 
first preponderates all happened in one year, and appear there- 
fore to be due to a special failure, analogous to that of No. 10, 
