74 



"W. M. SMALLWOOD AND ETJTH 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 

 dechne 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 ia 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 ceUs of Type II. If the change 



