REFERENCES. 



Agar, W. E. 



1913. Transmission of environmental effects from parent to offspring in Simo- 



cephalns vetvlus. Phil. Trans. Roy. Soc. London, B, 203, p. 319-350. 



1914. Experiments on inheritance in parthenogenesis. Phil. Trans. Roy. Soc. 



London, B, 205, pp. 421-489. 

 Banta, a. M. 



1913. Selection within pure lines in Daphnia. Science, n. s., 37, p. 272. 



1919. The results of selection with a Cladocera pure line (clone). Proc. Soc. Exp. 

 Biol. Med., 16, pp. 123-124. 

 Beidges, Calvin B. 



1919. The developmental stages at which mutations occur in the germ-tract. Proc. 



Soc. Exp. Biol. Med., 17, pp. 1-2. 

 CONKLIN, E. G. 



1920. The mechanism of evolution. VI. The cellular basis of evolution. William 



Ellery Hale Lectures before the National Academy of Sciences, April 1917. 

 Sci. Mont., May 1920, pp. 496-515. 

 EwiNG, H. E. 



1914. Pure-line inheritance and parthenogenesis. Biol. Bull., 26, pp. 25-35. 

 Gage, S. H. and S. P. 



1908. Sudan III deposited in the egg and transmitted to the chick. Science, n. s., 

 28, pp. 494-495. 

 Hanel, Elsie. 



1908. Vererbung bei ungeschlechtlicher Fortpflanzung von Hydra grisea. Jena. 

 Zeitschr., 43, pp. 321-372. 

 Hegner, R. W. 



1918. Variation and heredity during the vegetative reproduction of Arcella dentata. 



Proc. Nat. Acad. Sci., 4, pp. 283-288. 



1919. Heredity, variation, and the appearance of diversities during the vegetative 



reproduction of Arcella dentata. Genetics, 4, pp. 95-150. 



1920. The relations between nuclear number, chromatin mass, cytoplasmic mass, 



and shell characteristics in four species of the genus Arcella. Jour. Exp. 

 Zool., 30, pp. 1-95. 

 Jennings, H. S. 



1908. Heredity, variation, and evolution in protozoa. II. Heredity and variation 



of size and form in Paramecium, with studies of growth, environmental 

 action, and selection. Proc. Amer. Phil. Soc, 47, pp. 393-546. 



1909. Heredity and variation in the simplest organisms. Amer. Nat., 43, pp. 



321-337. 



1910. Experimental evidence on the eflfectiveness of selection. Amer. Nat., 44, 



pp. 136-145. 



1916. Heredity, variation, and the results of selection in the uniparental reproduction 



of Difflugia coronata. Genetics, 1, pp. 407-534. 



1917. Observed changes in hereditary characters in relation to evolution. Jour. 



Wash. Acad. Sci., 7, pp. 281-301. 

 KtJHN, Alfred. 



1908. Die Entwicklung der Keimzellen in den parthenogenetischen Gerenationen 



der Cladoceren Daphnia pulex De Geer und Polyphemus pediculus De 



Geer. Arch. Zellforsch., 1, pp. 538-586. 

 Lashley, K. S. 



1915. Inheritance in the asexual reproduction of Hydra. Jour. Exp. Zool., 19, 



pp. 157-210. 



1916. Results of continued selection in Hydra. Jour. Exp. Zool., 20. pp. 19-26. 

 McEwAN, R. S. K » . HH 



1918. The reactions to light and to gravity in Drosophila and its mutants. Jour. 



Exp. Zool., 25, pp. 49-106. 

 Middleton, a. R. 



1915. Heritable variations and the results of selection in the fission rate of Stylonychia 

 pustvlata. Jour. Exp. Zool., 19, pp. 451-503. 



169 



