Plantago Lanccolata Raniosa. 159 
comparison. At the beginning of the period of flowering 
no difference was discernible in either experiment be- 
tween the two halves, but it gradually became visible 
during the course of the summer. I picked off all the 
ears from the culture in sand at the end of July and at 
the end of August; here is a record of them: 
Number of lateral ears per primary ear Totals 
012345 
July 28th -! Sand 3 3 4 6 J i 20 
< Control 9 7 9 6 31 
A , ( Sand 14 10 12 8 3 1 48 
'( Control 12 2 10 7 6 2 39 
The difference though slight is distinct. It is more 
clearly brought out if the mean number of lateral ears 
j o 
per primary ear is calculated. In August in the plants 
on sand this was 1.5, in the control half 2. 
A similar effect was produced by shade which exerted 
a most deleterious effect on the whole growth of my 
experimental plants as will be seen from the small number 
of ears produced. I obtained the following figures in 
the same way as in the previous experiment. 
Number of lateral ears per primary ear Totals 
0123456 
Tnlv 28th * Shade 7627520 29 
[uly M Control 1 1 2 8 19 20 1 52 
. 1 \ Shade 15 1 1 2 19 
( Control 21 9 20 16 10 3 79 
The mean number of subsidiary ears per primary 
ear in August in the shadow half was 0.5 and in the 
control half 2.0. 
In conclusion, the results of the whole series of ex- 
periments which has lasted over more than ten years 
may be summarized as follows : The Plantago lanccolata 
rainosa of ;//v experiment constitutes an "inconstant" 
