EFFECTS OF SELECTION ON ALKALOIDS IN BELLADONNA. il 
TasLe VII.—Temperature, precipitation, and days of sunshine at Arlington, Va., 
Madison, Wis., and Timmonsville, S. C., during May, June, July, and August, 1914. 
Temperature (°F.). Precipitation. Aspect of sky (days). 
Station and month. Nise | aNtesen Depart DES nae 
maxi- | mini- | Mean.| Total Clear. Y |Cloudy. 
arte Pa ER from 0.01 or cloudy. 
‘ i normal more 
Washington, D. C.:1 Inches. Inches. 
I hy es apse Se al 78 55 67 1. 72 —2..1 7 14 11 6 
AIUD Chee sham ay area hc 84 64 73.8 6. 20 2 11 12 12 6 
dhol aja es heteen Ree paeed 85 67 75.9 2.32 —2.3 12 7 12 eZ 
INU CUIS tee eas scree 86 66 76.4 6. 00 1.6 10 10 13 8 
cThanelic cscs si Seg YS Gel EGR SESH, te oan 2 43 48 32 
Florence, S. C.: 2 fe 
Wa Valeria creer 87.2 57.4 203 ETON eee ee 2 14 13 4 
PUNO Ce oo ios Ne S 92.1 68.9 80. 5 Payee key les ogee naa yaa 7 12 12 6 
MT aioe spear. oe 92.8 68. 5 80. 6 Solan |e ene meee 6 12 16 3 
PUI SUStie cee eelcta 89. 9 69. 3 79. 6 GAL sere eye ea 10 8 15 8 
TBO REM Nes esesis ise fs PT a cd DE (Opeth Si Pa aS ps A pace th 46 56 21 
Madison, Wis.: : ae 
May Re eS 69. 7 50. 9 60. 3 5.97 2635 13 9 14 8 
UO eases See 75.7 57.6 66. 6 3. 46 —0. 64 14 8 12 10 
AST yesh 8 Wises ceca a bi 83 64.6 73.8 1. 49 —2. 50 8 13 13 5 
PANIES Gide seerers ore 79.6 61 62.5 3.60 39 i 11 12 8 
FTN Gel aia Sie Pee ee AAG Oe hs ROS OLS ae 41 51 31 
1 The conditions at Washington should approximate very closely those at Arlington, Va. 
2 About 7 miles from Timmonsville, S. C.; volunteer observer. 
It has been claimed by some investigators that dry and sunny 
seasons will result in greater alkaloid production than wet and cloudy 
seasons. The data in Table VII will serve to throw some lght on 
this point. The plants from the three localities specified were all 
grown from the same seed, and it would appear that if the contention 
regarding climate were correct there should be some correlation be- 
tween the quantity of alkaloids found and the seasonal conditions. 
However, in the four months there is a difference of only about 3 
inches in the rainfall and a difference of only five in the number of 
sunny days. It is true that at Timmonsville the precipitation was 
the least and the number of sunny days the greatest, and the per- 
centage of alkaloids was also the greatest. It has already been 
pointed out, however, that only one picking of leaves was secured at 
this place, which may account for the high average percentage of 
alkaloids found; and, furthermore, the difference in climatic con- 
ditions is so small that little significance can be attached to it. It is 
possible, of course, that differences in soil conditions at the three 
stations may be sufficiently great to influence any relationship due 
to climatic conditions which might otherwise be apparent. 
