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bands. When counted the 
larv^ were killed, which 
reduced the number of 
larva3 of the succeeding 
generation. If the tree 
from which the record is 
taken should be covered 
with rough bark or have a 
large number of holes and 
cracks in it, the number of 
larvae entering the bands 
will not be so great as if 
the band were the only 
place in which they could 
hide to spin their cocoons; 
therefore, filling the holes 
and scraping away the 
rough bark would cause a 
rise in the curve. . 
In most cases the con- 
ditions which Avould ren- 
der the recoi'ds inaccurate 
were eliminated when it 
was possible to do so. In 
order to show the relations 
between the daily and the 
weekh" hand records, a 
weekly summary (fig. 6) 
was made of Gibson's daily 
band record. By this 
means it was shown that 
the weekly records are 
only approximate, and 
show the general trend of 
the insect in the orchard 
rather than any details. 
One writer has suggested 
that the rise and fall of 
the temperature would 
cause a corresponding rise 
and fall in the number of 
larv», so as to obscure the 
true position of the maxi- 
mum. B}^ a study of the 
record made by Mr. Gib- 
son (fig. 5), in which the 
