PLATE 7 
EXPLANATION OF FIGURES 
52 to 54 Portions of large diplotene nuclei, showing condensation and great 
thickening of the threads to form the tetrads. Note the size of the chromosomes. 
All are cut in these photographs; the size of the nuclei is so great that each one of 
these cells is cut into three parts when sectioned at a thickness of 8 to 10/x. In 
figure 54 note that the condensing chromosomes are split again — equational 
split. 
55 and 56 Portions of large cells in diakinesis. The ring tetrads are shown. 
57 Large diplotene nuclei. Nucleus almost completely fills cytoplasm. 
314 
