228 KANSAS UNIVERSITY SCIENCE BULLETIN. 



are noticeable because they have broken off from the vigorous 

 growth and lie among cells that are distinctly necrotic. 



Out of the 294 direct divisions in all the nests only 7 occurred 

 in the first row on the edge of the nest. 



Out of the 357 indirectly dividing cells 63 occurred in the 

 first row on the edge of the nest. 



The direct divisions in all the nests averaged 1.68 rows 

 nearer the center than the indirect divisions. 



Cell Nest 12. This nest was sketched and counted in 

 forty-two serial sections. It began as three or four groups 

 of cells which were the cross sections of limbs which later 

 fused into a common trunk. It was non-necrotic throughout. 



Cell Nest 12, I. 



Tier 12 3 4 5 6 



Direct D 1 . . . 



Indirect D 2 1 4 . . . 



Cell Nest 12, II. 



Direct D 



Indirect D 4 . i i ! '. 2.8 '. 6 140 



Direct D 



Indirect D 1 2.0 . 1 78 



Direct D 



Indirect D 2 . . 1 . . . 2.0 . 3 77 



Cell Nest 12, V. 



Direct D 



Indirect D 2 3 1 . 



Cell Nest 12 



Direct D 1 . 



Indirect D 1 1 



Cell Nest 12 



Direct D 1 1 . 



Indirect D 2 1 



Cell Nest 12 



Direct D 



Indirect D 1 3 . 3 



Cell Nest 12 



Direct D 1 1 



Indirect D 1 1 1 



VI. 



VII. 



VIII. 



IX. 



1.8 . 6 180 



3.0 1 



2.5 . 2 81 



2.5 2 



2.3 . 4 85 



2.7 . 7 83 



3.5 2 



2.0 . 3 86 



Cell Nest 12, X. 



Direct D 2 . . . 4.0 2 



Indirect D 2 2 1.4 , 4 169 



