DISPOSITION OF CHROMOSOMES IN MITOSIS. 



2O I 



Their resemblance to the nuclear spiremes is evident. Such 

 spireme figures may exhibit a great variety of forms ; at present, 

 however, I shall not attempt to enumerate these in detail ; a later 

 paper will contain drawings showing the exact form assumed by 



FIG. 2. Spireme from six separate filaments and disposition of individual mag- 

 nets shown by the small circles. 



the filaments under a variety of conditions : varying their num- 

 ber, size and structure, as well as the intensity of the central 

 attractive force. 



The formation of the equatorial plate may be simulated by the 

 use of similar floating aggregates of needles, which in this case 



/ \ 



FIG. 3. Arrangement shown by group of four chromosome models each with 9 

 magnets. 



are strung along flexible wires capable of being bent into any 

 desired shape. In this way the aggregate may be given the 



