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Cj:npbL"ll Art Co., Elizabeth. N. J. 



FIGS. 9 to 16, shown on plates 2, 3, 4 and S, represent detailed drawings of typical sections through the region 

 of the embryonic plate indicating the arrangement of the three germ-layers. The section numbers 

 are as follows: Fig. 9, Section No. 78; Fig. 10, Section No. 75; Fig. 11. Section No. 70; Fig. 12, 

 Section No. 67; Fig. 13, Section No. 64; Fig. 14, Section No. 59; Fig. 15, Section No. 56; Fig. 16. 

 Section No. 50. All of the figures are enlarged about 180 diameters. 



