I INTEODUCTION 31 



in many cases exhibit a development showing larval and embryonic 

 stages, but because in most cases it is not easy to determine what 

 corresponds to the adult stage in Protozoa, and their life-histories are 

 too imperfectly known for profitable comparison. 



LITERATURE 



Most of the works Gontained in this list are of the nature of snmmaries or text-books, 

 in which full reference to all the earlier works on the subject will be found. 



Agar, W. E. The Spermatogenesis of Lepidosiren paradoxa. Quart. Journ. Micr. 

 Soc. vol. 57, 1911. 



Bateson, W. Mendel's Principles of Heredity. Cambridge, 1909. 



Born. Experimentelle Untersuchungen iiber die Entstehung der Geschlechtsunter- 

 schieden. Breslauer artzlicher Zeit. , 1881. 



Conklin, E. G. Karj'okinesis and Cytokinesis in the Maturation, Fertilization, and 

 Cleavage of Grepidula and other Gastropoda. Journ. A.N.S. Phila. vol. 12, 1902. 



Darwin, C. The Variation of Animals and Plants under Domestication. London, 

 1868. 



Driesch, H. The Science and the Philosophy of the Organism. Gifford Lectures. 

 Aberdeen, 1907 and 1908. 



Duesberg, J. La Spermiog^nese chez le rat. Arch. Zellforsch. vol. 2, 1909. 



Godlewski, E. Untersuchungen iiber die Bastardierung der Echiniden- und 

 CrinoidenfamiJien. Arch. Ent. Mech. vol. 20, 1906. 



Herbst, C. Vererbungsstudien V. Ibid. 



Hertwig. Vergleich der Ei- und Samenbildung bei Ascaris megalocephala. Arch. 

 Mikr. Anat., vol. 36, 1890. 



Eupelwieser. Entwicklnngserregung bei Seeigeleier durch Molluskensperm. 

 Arch. Ent. Mech. vol. 22, 1906. 



Loeb. Die chemisohe Entwicklnngserregung des tierisohen Eies. Berlin, 1909. 



Montgomery. Some Observations and Considerations upon the Maturation-phen- 

 omena of Germ Cells. Biol. Bull. vol. 6, 1904. 



Sehaxel, J. Das Zusamraenwirkungder Zellbestandteilebei derEireifung, Furchung 

 und ersten Organbildung der Eohinodermen. Arch. Mikr. Anat. vol. 76, 1911. 



Sedgwick. On the Law of Development commonly known as Von Baer's Law, and 

 on the Significance of Ancestral Rudiments in Embryonic Development. Quart. Journ. 

 Micr. Sci. vol. 36, 1894. 



Sedgwick. The Influence of Darwin on the Study of Animal Embryology. Darwin 

 and Modern Science. Cambridge, 1909. 



Sharpe. Insects. Camb. Nat. Hist. vol. 5, 1895. 



Shearer. The Problem of Sex Determination in DinopMlus gyrociliatus. Quart. 

 Journ. Mic. Sci. vol. 57, 1912. 



Weissman. Die Kontinuitat des Keimplasraas als Grundlage einer Theorie der 

 Vererbung. Jena, 1886. 



Weissman. Das Keimplasma, eine Theorie der Vererbung. Jena, 1892. 



Wilson, E. B. The Sex-Chromosomes. Arch. Mikr. Anat vol. 77, 1911. 



