THE DIVIDING CELL 



343 



in this way. He let a drop of solution spread out on a slide so 

 as to form a flattened plano-convex lens, and at the two ends 

 introduced "similar" osmotic centres. Under these circum- 

 stances the stream-lines from either centre lassume the dis- 



B 



Fig. 9. — Polyasters of magnetic dust. B represents in a plane the figure oi four like poles 

 and a central inductor such as corresponds to the tetrahedral figure of the heterotype 

 division in Liverworts, where the chromosomes represent the central inductor. 



tribution of half-spindles, with their lines concave to the axis 

 but their basal ends at the equator never blending. The 

 assumption of this form is due to the necessary constrained 

 parallelism of the outermost stream-line to the boundary of 



