I INTRODUCTION 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 contained in this list are of the nature of summaries 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 paradoxn. 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. Breslaner artzlicher Zeit., 1881. 



Conklin, E. G. Karyokinesis and Cytokinesis in the Maturation, Fertilization, and 

 Cleavage of Crepidnln 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 Spermiogenese chez le rat. Arch. Zellforsch. vol. 2, 1909. 



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

 Crinoidenfamilien. 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. 



Kupelwieser. Entwicklungserreguug bei Seeigeleier durch Molluskensperm. 

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



Loeb. Die ehemische Entwicklungserregung des tierischen Eies. Berlin, 1909. 



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

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



Schaxel, J. Das Zusammenwirkung der Zellbestandteile bei der Eireifung, Furchung 

 und ersten Organbildung der Echinodermen. 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 Dinopliilus gyrociliatus. Quart. 

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



Weissman. Die Kontinuitat des Keimplasmas 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. 



