SPECIFICITY IN FERTILIZATIOX 



22 



Pi'LUGER, E. 



1882. "Die Baslardzcugung bci den Batrachiern," Arch. 

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PFLiJGER, E., AND SmITH, W. J. 



1883. '' Untcrsuchungen uber Bastardicrung der anuren 

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PiNNEY, Edith. 



1918. '^\ study of the Relation of the Behavior of the 

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Potts, F. A. 



1910. "X^otes on the Free-living Nematodes," Quart. Jour: 

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 Reynolds, E. 



1915- ''Prognosis of Sterility," Jour. Amcr. Med. Assoc, 

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Shearer, De Morgan, and Fuchs. 



1913- "On the Experimental Hybridization of Echinoids," 

 Phil. Trans. Roy. Soc. London, Ser. B., CCIV, 255- 

 362. 



Smith, G. W. 



1906. Rhizocephala— Fauna und Plora des Golfes Neapel, 

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Sobotta, J. 



191 1. "Ueber das Verhalten der Spermatozoen im Uterus 

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Stout, A. B. 



1916. ''Self- and Cross-Pollinations in Cichorium intyhus 

 with Reference to Sterility," Mem. New York Bot. 

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1917- Fertility in Cichorium intyhus; the Sporadic Occur- 

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