68 On a method of studying Geotropism . 
Average of 51 angles = 58*4. 
In spite of the want of uniformity, the results are sufficiently 
clear when the averages are compared. 
Average Angle. Gr as 
Horizontal . 
Above 
Below 
100 
73*3 
73' 8 
From these figures we get some idea of the amount of 
difference in geotropic tendency between horizontal and 
oblique stems. Having regard to the want of uniformity in 
the angles, it would not be safe to suppose that the averages 
represent the difference in question with any kind of accuracy. 
But they certainly confirm the belief that the horizontal 
position is the most favourable for geo tropic stimulation. 
The results with plantain were confirmed by a few experi- 
ments (three sets of 12) made with flower-stalks of the 
cabbage. Here the average angles were : — Or as 
Horizontal . . . 527 :ioo 
Above .... 33-2 63-0 
Below .... 39-8 75-5 
We do not attach any importance to difference between 
the Aboves and Belows , because the number of experiments is 
too small to allow of trustworthy conclusions. But the ex- 
periments with cabbage, like those with plantain, certainly 
give additional support to the belief that the horizontal 
is the position of maximum effect. 
Cambridge, February , 1888. 
