ILLUSTRATIONS 17 



via. PAOB 



75, 76. The necessity for sensory decussation in the primitive 



Fish 236 



77. The necessity of crossed motor optic tracts .... 237 



78. The functional areas of the right human cerebral hemi- 



sphere 238 



79. Alternation of Cycle-stages where there is cell-discon- 



tinuity 241 



80. Alternation of Cycle-stages in filamentous growth . . 241 



81. Protoplastic, ccenocytic, and mycelial alternation of Cycle- 



stages 242 



82. Alternation of Cycle-stages in presence of Zooidal dis- 



continuity 243 



83. Alternation of Cycle-stages in Zooidal continuity . . 243 



84. Cells with karyokinetio chromatin figures .... 249 



85. The " Monaster " and " Dyaster " 249 



86. The lines of magnetic force of a bar magnet . . . 251 



87. The magnetic field between dissimilar poles . . . 252 



88. The magnetic field between similar poles .... 253 

 89-92. Suggestions concerning significance of karyokinetio 



phenomena 254, 255, 256 



93. Formation of Polar Bodies in Asterias glacialis . . 257 



