402 
Cooperative Investigations on Plants 
words, it does not appear that the circumstances which lower the mean of the 
stigmata are the same as those wliich lower variability. If we classify in order of 
variability we find the seven most variable stations give a mean of 12'6 bands, 
and the eight least variable a mean of 12'S bands, two values, the difference of 
which is only doubtfully significant. In fact, it will be found that very fertile 
crops like Kidderminster I., Enfield I., and Parkstone rank in the same class of 
lesser variability with starveling cro^js like those of Streatham and Chelsea; while 
the high variability group embraces low types like those of Highgate, Arncliffe, 
and Oxford. The high situation, cold and late season of Arncliffe reduced the 
number of stigmata, but left the plants highly variable, the potting at Oxford 
produced the same result, but the causes which produced the starveling crop at 
Streatham were as influential in reducing its varia.bility as in lowering its type. 
The general inference to be drawn is that both in variability and type the influence 
of environment, local or seasonal, on plant life is extremely large, and that careful 
investigations of the correlation of locality, soil, and seasonal meteorological 
conditions with plant type and variability would give valuable results. Meanwhile 
we can only adopt methods of studying resemblance, which as far as possible 
eliminate this influence, 
TABLE II. 
Percentages of Certain Characters in Different Gro])s of same Season. 
Character 
Crop 
Percentage 
With more than 13 Stigmata 
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Parkstone 
Kidderminster II. 
Arnclifle 
Streatham 
63-0 
53-3 
24-8 
8-8 
With more than four Petals or witli) 
some petaloid stamen.s \" 
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Parkstone 
Kidderminster II. 
Arnclifle 
Streatham 
17-6 
16-8 
16-2 
13-8 
Percentages of Flowers with some red 
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Kidderminster II. 
Arncliffe 
Parkstone 
Streatham 
35-0 
33-8 
25-5 
25-0 
Without margins 
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Kidderminster II. 
Parkstone 
Arnclifle 
Streatham 
72-6 
71-3 
63-9 
61-0 
With slight or no basal patches ... 
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Streatham 
Kidderminster II. 
Parkstone 
Arnclifle 
52-4 
36-4 
30-7 
18-4 
With slight or no wrinkling 
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Parkstone 
Kidderminster II. 
Streatham 
Arnclifle 
92-9 
78-7 
78-6 
65-6 
