INFLUENCE OF CERTAIN CLIMATIC FACTORS 
7 
than Stations O 2 and O 3 on the north side of the ridge. Station O 6 
is also an exception to the general rule since though at an elevation of 
only 1,500 feet it showed but 10 cm. growth for a year. The writer 
is quite unable to explain this condition beyond the possibility that 
this reduced growth may be due to the fact that the trees inoculated 
were in a rather deep and shady ravine. 
Table II 
Lateral Growth of Cankers of Endothia parasitica at the Various Stations on Overlook 
Mountain, Woodstock, N. Y. 
Station 
Elevation 
Year 
Cm. 
Year 
Cm. 
(in Feet) 
Ending 
Ending 
07 
600 
May 25 
15 
Aug. II 
15 
S3 
1,000 
26 
15 
II 
16 
S I 
1,500 
24 
14 
II 
15 
c 
1,500 
23 
14 
II 
06 
1,500 
25 
10 
Aug. 12 
10 
0 I 
1,900 
27 
14 
12 
13 
0 2 (north side of ridge) 
2,500 
26 
II 
13 
II 
0 4 (south side of ridge) 
2,800 
26 
13 
13 
II 
0 3 (north side of range) 
2,900 
26 
1 1 
13 
10 
Climatological Data 
In comparing the growth of this fungus with climatic conditions 
the highest degree of accuracy could be obtained only by carrying on a 
complete series of meteorological observations in each locality. This 
procedure, which would have required an observer stationed at each 
point, was impracticable. Consequently, it was decided to depend 
entirely on the data regularly furnished by the U. S. Weather Bureau. 
This, of course, necessitates neglecting certain factors known to be 
important to plant life. The writer is of the opinion, however, that 
if progress is soon to be made toward understanding the climatology 
of plant disease a serious attempt must be made to utilize the meteoro- 
logical data already available. 
While the climatic data available from the Weather Bureau records 
are not all that might be desired, all the stations except Van Bibber, 
Md., and Fairfax, Va., furnish daily maximum and minimum tem- 
peratures and amount of precipitation, as well as the number of clear, 
partly cloudy, and cloudy days, and the prevailing direction of the 
wind for each month. The date of last killing frost in spring and first 
