2O2 



R. S. LILL1E. 



form of any one of the various types of chromosome, and it thus 

 becomes possible to study the effect which changing the form of 

 the chromosomes has upon the configuration of the equatorial 



FIG. 4. Arrangement shown by eight loop-shaped chromosome models. 



plate. These chromosome models repel one another, and, like 

 the isolated needles, they are found to exhibit very constant and 

 regular configurations when subjected, as above described, to the 

 attractive influence of the large magnet. The resemblance to 



IMG. 5. Group of twelve loop-shaped chromosome models. 



the configurations observed in the equatorial plates of actual 

 cells is often very striking. I have made experiments with 

 varying numbers of such chromosome-like aggregates and have 



