344 ORILLA STOTLER WERNER. 



sizes. In some cases chromosomes especially of the short rod- 

 type might be connected by two such filaments in such a way as 

 to extend one from either corner of the end of an individual 

 chromosome and attaching in like manner to the end of the next 

 chromosome. In other cases both filaments might be fastened 

 at the same point on a rod-shaped or a globe-shaped chromosome 

 (Fig. 10). 



Of the inconstant groups one composed ot eighteen small 

 chromosomes may be seen in Fig. 9. In the upper part of this 

 figure there is a group of two chromosomes attached to one of the 

 large J-shaped chromosomes. Fig. 13 shows a group of 13. 

 Sometimes filamentous fastenings occur between the smaller 

 chromosomes when these bodies lie in what is, apparently, a 

 linear arrangement. However no cells have been observed in 

 which all the chromosomes so arranged were fastened by fila- 

 ments. If such a condition exists, it would be exceedingly 

 difficult to discover since the chromosomes so arranged lie close 

 together and are usually at two foci, the one lying over the other 

 or nearly so. 



Of the groups having the more constant types ot fastenings one 

 may be seen in Figs. 1,9, 10 and 12. In this group ten of the 

 chromosomes belonging to the intermediate series, seem to be 

 connected end to end by interchromosomal filaments in such a 

 way as to form two chains of five chromosomes each, consisting 

 each of two rods and three globes. The members of the one 

 series are similar in size to those of the other group. There are 

 also in late prophase, four chromosomes belonging to the inter- 

 mediate series connected end to end in such a way as to form two 

 chains of two chromosomes each (Figs, i, 9, 12). 



Quite often the greater number of the small chromosomes ap- 

 pear to be in linear arrangement, I believe that in some cases they 

 extend in a circle within the nucleus. In late prophase there 

 seems to be a row extending almost across the space within the 

 circle of the large chromosomes (Figs. 8, 9, 12). In some cases 

 this row bends a little as a line appears when it extends around a 

 globe. Manipulation of the fine adjustment shows that another 

 row similar to this one lies at a deeper focus (Fig. 12) apparently 

 at the opposite side of the nucleus. (It must be borne in mind 



