July, 1922] STEVENS ENVIRONMENTAL TEMPERATURES 
to some extent the temperature conditions to which the fungus was exposed 
on that day. 
Table 2, Temperatures in Degrees Centigrade of Blackberry Canes about i cm. in 
Diameter. Thermometer Bulbs placed in the Pith. Livermore, Maine, June 
24, ig2i. A Day with Drifting Cumulus Clouds 
Time A.M. 
Air m Shade 
Live Cane 
Dead Cane 
9 "00 
24 
24 
Shade 
24 Shade; no sun 
on plant 
9:30 
24-5 
30 
Sun 
30 Sun 
945 
24 
29 
Shade 
27 Shade 
10:00 
24 
'JO 
Sun 
30 Sun 
10:50 
24 
31 
Sun 
31 Sun 
II :oo 
25 
Sun 
32 Sun 
P M 
12 :30 
0 /I c 
31 
Shade 
31 Shade (for a few 
minutes) 
I :oo 
25.5 
32 
Sun 
3 1 Sun 
1:30 
26 
28 
This cane shaded by its 
31 Sun 
own leaves 
ZKi 
27 
This cane shaded by its 
28 Shade 
own leaves 
I :z|.o 
29 
This cane shaded by its 
own leaves 
32 Sun 
2:00 
26 
29 
This cane shaded by its 
own leaves 
33 Sun 
2:30 
27 
28 
This cane shaded by its 
own leaves 
35 Sun 
3:00 
26 
27 
This cane shaded by its 
own leaves 
33 Sun 
3:30 
25 
26 
This cane shaded by its 
own leaves 
31 Sun 
4:00 
24-5 
25 
This cane shaded by its 
28 Sun 
own leaves 
4:30 
24 
24 
This cane shaded by its 
own leaves 
27 Sun 
6:30 
20.5 
19.5 Shade 
20 Shade 
6:45 
20 
19 
Shade 
20 Shade 
7:00 
19 
18 
Shade 
19 Shade 
Although the figures pubHshed in these notes refer only to twigs and 
branches, there is abundant evidence that a similar relation holds in the 
case of other aerial plant parts. Data showing that the temperature of 
various small fruits in sunlight is usually above that of the air were pub- 
lished in 1918.^ Individual strawberries (Fragaria sp.), for example, were 
often found to be 10° C. or more above the temperature of the air. These 
observations agree with those of Miintz^ (p. 223) on grapes. Miintz found 
^ Stevens, N. E., and Wilcox, R. B. C. Temperatures of small fruits when picked. 
Plant World 21 : 176-183. 1918. 
^ Miintz, M. A. Recherches experimentales sur la culture et I'exploitation des vignes. 
Ann. Sci. Agron. Franc. Etrang. II, i^: 1-272. 1895. 
