48 



Journal of Applied Microscopy. 



Figure 2.— This preparation is a teased one from the skin of the 

 salamander, loaned by Dr. G. W. Webster, Chicago. The magnification is 

 1500 diameters. The stage of division is in the anaphase. The chromatin 

 has partially divided into segments forming the mother wreath. The 

 amplification is so great that some detail of the chromatin thread is 

 discernible. 



Figure 3. — This illustration is from the same preparation, and at the 

 same magnification as figure 2. The stage of division is a later one. 

 Segmentation of the chromotin thread has been completed and the mother 

 wreath is fully formed. Pressure on the cover glass has flattened the cell 

 considerably, therefore the chromatin segments probably occupy more of 

 the cell space than they do in the cell normally. 



Figure 4. — This illustration is from a preparation by Dr. Charles 

 Chamberlain of the University of Chicago, showing the first division of the 

 macrospore nucleus in Lilium philadelphicum. The magnification is 425 

 diameters. The stage represented is one near the end of metakinesis. 

 The chromosomes have migrated to the polar fields near the position that 



