352 BOTANICAL GAZETTE. [NOVEMBER 
The collections from Norway were taken on June 22, 1905, from the 
two sides of a private road, about 12 feet wide, which several years 
previously had been run through an open field. The ground slopes 
in such a manner that the north side of the road receives practically 
all of the drainage, while the south side is drier and less favorably 
supplied. Noticing an apparent difference in the daisies of the 
two sides of the road, I marked a 
starting point and picked every head 
pees SOLS eae within about two feet of the road, till 
BETWEEN JULY 3 anp Jury 150 had been collected from each side. 
sla at The table (Table V) based on the 
TABLE IV 
counts shows clearly a tendency for the 
= pa i ide of 
ie es heads growing on the north si 
13 3 the road to have a large number of 
= é rays, and for those on the south side 
- 9 to have a much smaller number. This 
28 2 difference between the, two lots, tt 
= a seems to me, may be regarded as 
he 176 clearly indicating a relations 
23 pre the amount of moisture or nutrition ap 
i 84 the number of ray florets. 
26 te - Very similar results were — 
28 ed from two lots of 250 heads, oo 
o &6 lected at Dennis, July 13 and 14. 4? i 
31 52 of these lots (Table VI, B) was from 
res ~ a rosebush tangle near the sea; ; . 
38 7s other (Table VI, A), was from a ai 
30 ee field near by. These lots pet ; 
38 ? show clearly a tendency for e 4 
30 2 ing j i d richer s0 
39 growing in more moist an 
% to have a higher number of rays- 
HH 
seem [0 
These various observations : 
indicate that the number of ray florets in the daisy is in pat oe 
tioned by two general factors: an external factor, nutrition; ; 
another, which might possibly be termed internal, namely, 
tendency which gives rise to modes. A slight investigation 
latt 
, : the 
the er has led me to believe that. the explanation of 
and 
