BUCKINGHAM. — DIVISION OF LABOR AMONG ANTS. 



455 



may have had something to do with the difterence.in our results, for 

 while my ants were thus stimulated to unusual activity, his experiments 

 were carried on at room temperature in winter. 



TABLE III. 



I do not find from these experiments any very striking evidence of 

 a correlation between size and the habit of foraging. I have plotted 

 frequency polygons (Figures 12-14) for three of the various activities 

 studied. For this purpose the ants experimented with were divided 

 into six classes, based on the size of the head expressed in sq. mm. 

 (length X breadth). The class values are indicated along the axis of 

 abcissas. The values along the axis of ordinates are the average per 



