38 
Psyche 
[February 
Examinations of the cornstalks of these experiments in the 
spring of 1924 showed that 16 of these stations exhibited feeding 
by birds to a noticeable extent, while the remainder showed 
either a mere trace of bird feeding or no evidence of such feeding 
at all. In Table 3 those stations that showed bird feeding are 
listed together with the number and percentage of larvae ap- 
parently removed from the stalks by birds. 
The average winter mortality for the 38 stations listed in 
table no. 3 was 4 per cent. 
The average per cent of larvae apparently taken by birds in 
the 16 stations that showed bird feeding (based on the average 
recovery per stalk in experiments not touched by birds) was 54. 
The average per cent of larvae apparently taken by birds 
in the total number of 47 experiments (based on the average 
recovery per stalk in experiments not touched by birds) was 19. 
Three stations were lost or destroyed, leaving 31 that showed 
either a mere trace of bird feeding or none at all. The infestation 
in the fall was on an average 310 larvae per station. Spring ex- 
aminations of the 31 stations that showed no important feeding 
by birds proved that the average infestation at that time was 
14.7 larvae per stalk or 294 larvae per station, an apparent loss 
per station of 16 larvae or approximately 5 per cent of the ex- 
pected larvae. This loss is slight when it is remembered that in 
some stations birds apparently did take a few of the larvae, and 
that the cornstalks were necessarily handled several times and 
were transported for considerable distances, so that small pieces 
were sometimes broken off and lost. These figures, however, 
are offered to show that the findings as regards bird feeding, 
shown in Table no. 3, present a fair picture of the extent to 
which birds fed on this material. 
These results show a considerable increase in the area in 
which birds fed extensively, (Fig. 2 and 3) over the results ob- 
tained in the spring of 1923. This may be due to the fact that 
the larger number of stations provided a much more accurate 
test of conditions and so gave a much better picture, or it may 
indicate a widening field over which birds have become aware of 
an existing food supply. There is also a possibility of the element 
of chance entering to the extent that if the right species of birds 
