22 THE ANIMAL PARASITES OF MAN 



of prey undamaged, and there, having become larger and more 

 capable of resistance, maturity was attained. By means of this in- 

 cidental coincidence of various favourable circumstances, these pro- 

 cesses, according to Moniez, have been established by heredity and 

 have become normal. 



This is not the place to express an opinion either for or against 

 the various hypotheses advanced, but the existence of these diametri- 

 cally opposed views alone will show the great difficulty of the 

 question. Independently, however, it appears more natural to come 

 to the conclusion that parasitism, as well as change of hosts, were 

 gradual transitions. 



As a conclusion to this introductory chapter, a list of some of 

 the most important works on the parasitology of man and animals 

 is appended. 



LITERATURE. 



GOEZE, J. A. E. Versuch einer Naturgeschichte der Eingeweidewiirmer thieri- 

 scher Korper. Blankenburg, 1782. 4to, 471 pp., with 44 plates. 



ZEDER, J. G. H. Erster Nachtrag zur Naturgeschichte der Eingeweidewiirmer, 

 von J. A. E. Goeze. Leipzig, 1800. 4to, with 6 tables. 



RUDOLPHI, C. A. Entozoorum sive vermium intestinalium historia naturalis. 

 I, Amstelod., 1808; ii, 1809. 8vo, with 18 plates. 



RUDOLPHI, C. A. Entozoorum synopsis. Berol., 1819. 8vo, with 3 plates. 



BREMSER, J. G. Ueber lebende Wiirmer im lebenden Menschen. Wien, i8ig. 

 8vo, with 4 plates. 



BREMSER, J. G. Icones helminthum, systema Rudolphii entozoologicum illus- 

 trantes. Viennae, 1824. Fol. (Paris, 1837). 



DUJARDIN, F. Histoire naturelle des helminthes ou vers intestinaux. Paris, 

 1845. 8vo, with 12 plates. 



DlESlNG, C. M. Systema helminthum. 2 vols. Vindobonnae, 1850, 1851. 8vo. 

 Supplements by the same author : Revision der Myzhelminthen (Report 

 of the Session of the Imp. Acad. of Science. Wien, xxxii, 1858); with 

 addendum (ibid., xxxv, 1859); Revision der Cephalocotyleen (ibid., xlix, 

 1864, and xlviii, 1864) ; Revision der Nematoden (ibid., xlii, 1861) ; Supple- 

 ments (ibid., xliii, 1862). 



BENEDEN, P. J. VAN. Memoire sur les Vers intestinaux. Paris, 1858. 4to, with 

 12 plates. 



KUCHENMEISTER, F. Die in und an dem Korper des lebenden Menschen vorkom- 

 menden Parasiten. Leipzig, 1855. 8vo, with 14 plates. 



LEUCKART, R. Die menschlichen Parasiten und die von ihnen herriihrenden 

 Krankheiten. I, Leipzig, 1863; II, Leipzig, 1876. 8vo. 



COBBOLD, T. SP. Entozoa ; an Introduction to the Study of Helminthology. 

 London, 1864. 8vo. Supplement, London, i86g. 



DAVAINE, C. Traite des entozoaires et des maladies vermineuses de 1'homme et 

 des animaux domestiques. 2nd edit. Paris, 1877. 8vo. 



LlNSTOW, O. V. Compendium der Helminthologie, ein Verzeichniss der 

 bekannten Helminthen, die frei oder in thierischen Korpern leben, 

 geordnet nach ihren Wohnthieren, unter Angabe der Organe, in denen 

 sie gefunden sind, und mit Beifiigung der Litteraturquellen. Hanov., 

 1878. 8vo. Supplement, including the years 1878-1888, Hanov., 1888. 



COBBOLD, T. SP. Parasites; a Treatise on the Entozoa of Man and Animals, 

 including some Account of the Entozoa. London, 1879. 8vo. 



LEUCKART, R. Die Parasiten des Menschen und die von ihnen herriihrenden 

 Krankheiten. 2nd edit. Leipzig, 1879-1886. The Protozoa, Cestodes, 

 Trematodes and Hirudinea have hitherto appeared (continued by 

 Brandes). 



BUTSCHLI, O. Protozoa in Bronn's Klass. u. Ordn. d. Thierreichs. Vol. i, 

 Leipzig, 1880-1889. 8vo, with 79 plates. 



