PLATE XLIX. 



Effects of Electric Current. 



Fig. 80. Exp. 997 (3) : 1 volt, 15 min., normal 30 min. Egg and sperm nuclei are la- 

 little chromatin, sphere material in granules, no segregation of yolk and cytoplasm. 

 Fig. 81. Exp. 997 (3) : Similar to preceding. 

 Fig. 82. Exp. 1106: 5 mil. amp., 5 min., normal 17 hrs.; nuclear membrane dissolved 



clumped; development stopped. 



Fig. 83. Exp. 1106: Similar to preceding. 



Fig. 84. Exp. 1 106 : Similar to preceding. 



Fig. 85. Exp. 997 (3) : Similar to fig. 80, but with nuclear membrane gone. 



Fig. 86. Exp. 1140 (1): 2 mil. amp., 2 min., normal 5* hrs. Chromatin disappearing 



Fig. 87. Exp. 1140 (2): 5 mil. amp., 10 min. Ordinary tetraster. 



Fig. 88. Exp. 997 (2) : 1 volt, 15 min., normal 2| hrs. Plasma and nuclei displaced 



current, as in centrif uged eggs. 



Fig. 89. Exp. 997 (2) : Similar to preceding. 



Fig. 90. Exp. 1121 (2): Chromosomes have disappeared leaving the spindle fiber 



chromatic than in normal eggs. 



Fig. 91. Exp. 997 (2) : 1 volt, 15 min., normal 2\ hrs. Chromatin largely 



dissolved and displaced 



toward lower pole; in right cell long strands of cytoplasm. 



Fig. 92. Exp. 1121 (2) : 5 mil. amp., 10 min., normal 3* hrs. Spindle and chromosomes disappeanng 



in left cell ; others normal 



Fig. 93. Exp. 998 (2): 4 dry cells If hrs., normal 11 hrs 



was in an advanced 



(ca. 42 cells) at the time of the experiment. Although the cells are not dead, the micromeres are rounaea 



and many have dropped 



