PLATE 9 



EXPLANATION OP FIGURES 



33 to 37 Representing the lengths of the chromosomes in the cells indicated 

 in the table below at a magnification of 1316. The differences in the lengths of 

 the lines and also the spaces between the lines represent relative differences in 

 chromosome lengths. For convenience the width of the spaces between the 

 lines are made eight times the differences in lengths. The lengths of the chromo- 

 somes and their percentage of the average length in the cell is shown in the 

 table below. The amount of foreshortening in any chromosome is indicated in 

 plate 8. 



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