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THE AMERICAN NATURALIST [Vol. XLVIII 



berg's 3 work on species hybrids of Drosera, Moenkhaus 's 4 investi- 

 gations of species hybrids in fish and some work on certain 

 hybrids in the Echinodermata group give us facts that directly 

 oppose such an assumption. As a further criticism, one may say 

 that most biologists who have had experience with pedigree cul- 

 tures would decidedly criticize the synoptic outline and the nar- 

 row sphere assigned to Mendelian phenomena. 



Aside from the theoretical considerations, these two papers con- 

 tain descriptions of Citrus-like species new to occidental horti- 

 culture, together with a somewhat detailed account of the various 

 Citrus hybrids and their hardiness and practical value, showing 

 the truly fine results achieved by the workers in this field toward 

 moving the Citrus belt northward and adding new varieties of 

 this genus to the world's horticulture. 



Orland E. White 



Brooklyn Botanic Garden, 

 December 4, 1913 



s Bosenberg, O., ' ' Cytologische und Morphologische Shidien an Drosera 

 longifolia X D. rotundifolia, ' ' Kungl. Svenska Yetenskapsakademiens Hand- 

 linger., 43, N: ou, pp. 1-64, 1909. 4 Tafn. 



4 Moenkhaus, W. J., ' ' The Development of the Hybrids between Fundulus 

 heteroclitus and Menidia notata with especial reference to the Behavior of 

 the Maternal and Paternal Chromatin," Amer. Jour, of Anatomy, 3: 29-65, 

 1904. Plates I-IV. 



