THE JOURNAL OF EXPERIMENTAL ZOOLOGY, 



VOLUME 13, NUMBER 3, OCTOBER, 1912 



CONTENTS 



Edmund B. Wilson 



Studies on chromosomes. VIII. Observations on the matur- 

 ation-phenomena in certain Hemiptera and other forms, 

 with considerations on synapsis and reduction. v rom the 

 Department of Zoology, Columbia University. N ne plates 345 



Wayland M. Chester 



Wound closure and polarity in the tentacle of Metridium 

 marginatum. From The Museum of Comparative Zoology, 

 Harvard College. Eight figures 451 



Max Morse 



Artificial parthenogenesis and hybridization in the eggs of cer- 

 tain invertebrates. From Trinitv College . . 471 



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BALTIMORE, U. S. A. 



