XVIII SUMMAEY 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 psychic 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. 



■if 



" The harvest truly is •plenteous, but 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-bpok of Comparative Embryology, vol. 1, 1881. 



Darwin. Origin of Species. First Edition, 1859. 



Driesch. Studien Uber die Regulationsvermogen der Organismen bei Echiniden- 

 keiraen. No. 4, Die Verschmelzung der Individualitiit. Arch. Ent. Mech. vol. 10, 1900. 



Driesch. Neue Versuche iiber die Entwicklung verschmelzenen Echinidenkeime. 

 IMd. vol. 30, 1910. 



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

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



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

 Egg. Jiid. vol. 21, 1906. 



Kammerer. Vererbung erzwungener Farbveraudernngen. No. i, Das Farbekleid 

 des Fener-Salamanders {Salamander maculae). Ibid, vol. 36, 1913. 



MaoBrlde. Two abnormal Plutei of Echinus and the Light which they throw on the 

 Factors in the normal Development of Echinus. Quart. Journ. Mic. Soi., vol. 67, 1911. 



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

 and Modern Science.] Cambridge, 1909. 



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

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



Thompson. The Metamorphoses of the Hermit-crab. Proo. Boston Soo. Nat. Hist., 

 vol. 31, 1904. 



Walcott. Middle-Cambrian Branchiopoda, Malacostraca, Trilobita and Merostomata. 

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



