74 W. M. SMALLWOOD AND RUTH L. PHILLIPS 
in the series of measurements made when the plotted curves are 
viewed as a whole. Take the large multipolar cells which start 
in with an average diameter of 9.05 micra; then increase to 
9.89 during the mid-larva period, to be followed by a marked 
decline to the mid-pupa period. This is followed by an increase 
which is almost the same as the newly hatched adult and the 
old adult taken at 6.30 a.m. The average nuclear diameter of 
the winter bee is larger than the recently hatched larvae, 
late larvae, early pupae and young adults taken early in the 
morning. A similar study of the variations in nerve cells of 
Type II indicates a different series of growth sequences. Here 
the largest nuclear diameter is during the early pupa stage with 
no marked variation in the average until the old adults are 
reached. The averages for these three types of cells seems to 
us to indicate that there is a definite series of growth sequences 
that follow through the life cycle in the worker bee and that 
they are not dependent on each other. 
Beginning with the old adults taken at 6.30 a.m., there is a 
noticeable decrease in nuclear size in cells of Types I and III in 
the two following stages studied (11 and 12 of table) that is sim- 
ilar to Hodge’s results. But there is a more marked decrease 
in nuclear size in Type I from mid-larva to early pupa. <A simi- 
lar change is indicated in the cells of Type II. If the change 
