xvni SUMMAKY 663 



in Carboniferous days, the Vertebrata followed them on to land and, 

 though as Insecta the Arthropoda still maintain themselves and limit 

 the activities of land Vertebrata in many ways, yet if we have regard 

 to bulk of body, and above all to ps} r chic development, there can be. 

 no question as to which is really the victorious race. 



Our task is finished ; we have striven to represent the science of 

 Comparative Embryology, not as a well-ordered and complete system 

 of philosophy, but rather as a gold-mine from which rich rewards have 

 already been reaped, but of which only a small part has as yet been 

 developed, and which promises abundance of gratifying surprises and 

 rewarding returns to the worker of the future. 



" The harvest truly is plenteous, Init the labourers are few." 



LITERATURE REFERRED TO 



Allen. On the Fauna and Bottom-deposits near the 30-fathom line from Eddystone 

 Grounds to Start Point. Journ. Mar. Biol. Ass., vol. 5, 1899. 



Balfour. Text-book of Comparative Embryology, vol. 1, 1881. 



Darwin. Origin of Species. First Edition, 1859. 



Driesch. Studien iiber die Regulationsvermogen der Organismen bei Echiniden- 

 keimen. No. 4, Die Verschmelzuug der Individualitat. Arch. Ent. Mech. vol. 10, 1900. 



Driesch. Neue Versuche iiber die Entwicklung verschmelzenen Echinidenkeime. 

 Ibid. vo'l. 30, 1910. 



Herbst. fiber die Regeneration von Antennen-ahnlichen an Stelle von Augen. 

 Arch. Ent. Mech., vol. 9, 1899. 



Jenkinson. On the Effect of certain Solutions upon the Development of the Frog's 

 Egg. Ibid. vol. 21, 1906. 



Katnmerer. Vererbung erzwungener Farbveranderungen. No. 4, Das Farbekleid 

 des Feuer-Salamanders (Salamander maculae). Ibid. vol. 36, 1913. 



MacBride. Two abnormal Plntei of Echinus and the Light which they throw on the 

 Factors in the normal Development of Echinus. Quart. Journ. Mic. Sci., vol. 57, 1911. 



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

 and Modern Science.] Cambridge, 1909. 



Spemann. Entwicklungsphysiologische Studien am Triton-Ei. I. Arch. Ent. 

 Mech. vol. 12, 1901; II. Ibid. vol. 15, 1903 ; III. Ibid. vol. 16, 1903. 



Thompson. The Metamorphoses of the Hermit-crab. Proc. Boston Soc. Nat. Hist., 

 vol. 31, 1904. 



Walcott. Middle-Cambrian Branchiopoda, Malacostraca, Tiilobitaand Merostomata. 

 Smithsonian Miscellaneous Collections, vol. 57, No. 6, 1912. 



