CHROMATIN DEVELOPMENT AND HEREDITY 261 



the variable specificity of the effect of the cytoplasm toward the 

 foreign spermatozoon. 



LITERATURE CITED 



CoHN, Edwin J. 1916 The relation between the hydrogen ion concentration of 



sperm suspensions and their fertilizing power. Abstracts of the 



papers read at the fourteenth annual meeting of the American Society 



of Zoologists, December 27-29, 1916. 

 DoNCASTER, L., AND Gray, J. 1913 Cytological observations on the early stages 



of segmentation of Echinus hybrids. Quart. Jour. Mic. Sci., vol. 58. 

 Gray, J. 1913 The effects of hypertonic solution upon the fertilized eggs of 



Echinus (E. esculentusand E. acutus). Quart. Jour. Mic. Sci., vol. 58. 

 Hacker, V. 1895 tJber die Selbstandigkeit der viiterlichen und miitterlichen 



Kernbestandtheile wiihrend der Embryonalentwicklung von Cyclops. 



Archiv. f. mikr. Anat., Bd. 46. 

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ungen der Bastardbefruchtung. Jena. 

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Archiv f. mikr. Anat., Bd. 84, Abt. II. 

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1912 b The organism as a whole. 

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heteroclitus and Menidia notata with especial reference to the behavior 



of the maternal and paternal chromatin. Am. Jour. Anat., vol. 3. 

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Fundulus and Ctenolabrus. Jour. Exp. Zool., vol. 16. 

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1915 Development and heredity in heterogenic teleost hybrids. 



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 Tennent, D. H. 1910 Echinoderm hybridization. Pub. No. 132 of the Car- 

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JOURNAL OF MORIHOLOGT, VOL. 31, NO. 2 



