382 



D WIGHT E. MINNICH 



to the causes noted above, I have included in the polygon only 

 the first four values for each bee, thus giving equal weight to 

 every animal. Of the total two hundred and seven^ values rep- 

 resented in the polygon, 81.16 per cent are positive, whereas 

 only 18.84 per cent are negative, a ratio of over 4 to 1. 



18.84% 



81.16% 



-16-14-12-10-8 -6 -4 -2 2 4 6 8 10 12 14 16 18 20 22 24 26 



Degrees per cm. 



Fig. 11 Frequency polygon of the first four d values of fifty-two bees. The- 

 negative values are represented by the shaded areas ; the positive values, by the 

 clear areas. 



' In the case of one bee it was possible to include only three values for d, 

 because of a missing record. See Table 2 (Appendix), bee no. 45. 



