214 COMPARATIVE PHYSIOLOGY 



chemical treatment of individuation. However, when in 

 the Hght of such recent inquiries as have been touched on in 

 this chapter, one considers the fact that Httle more than a 

 decade has passed since entelechy was the centre of discussion 

 in developmental physiology, there is no justification for a 

 pessimistic attitude to the possibility of arriving at predictable 

 conclusions in this field of knowledge. 



Further Reading 



Child, C. M. (1915). Individuality in Organisms. Chicago. 



(1924). Physiological Foundations of Behaviour. New York. 



DCrken, B. (1919). Einfiihrung in die Experimentalzoologie. Berlin. 



GoLDSCHMiDT, R. (1923). The Mechanism and Physiology of Sex Deter- 

 mination. London. 



Jenkinson, J. W. (1909). Experimental Embryology. Oxford. 



Wilson, E. B. (1925). The Cell in Development and Heredity (3rd ed.). 

 New York. 



Recent Papers 

 Champy (1919). Arch. Morphol. Exp. et Gen., 1919. 

 Helff, O. M. (1924). The Oxygen Consumption of Thyroid and Diiodo- 

 tyrosine-fed Tadpoles. Proc. Soc. Exp. Biol. Med., 21, 34. 



Huxley, J. S. and de Beer, G. R. (1923). Studies in Dedifferentiation, 



IV. Quart. Journ. Micr. Sci., 67, 473. 

 Huxley, J. S. (1925). Studies in Amphibian Metamorphosis, II. Proc. 



Roy. Soc, (B) 98, 113. 



Hyman, L. H. and Bellamy, A. W. (1922). Studies on the Correlation 

 between Metabolic Gradients, Electrical Gradients and Galvanotoxis. 

 Biol. Bull. 43. 



Lund, E. J. (1921-22). Experimental Control of Polarity by the Electric 

 Current, I and II. Journ. Exp. Zool., 34 and 36. 



Shearer, C. (1924). On the Oxygen Consumption Rate of Parts of the 

 Chick Embryo, etc. Proc. Roy. Soc, (B) 96, 146. 



Spaul, E. A. (1925). Experiments on the Localization of the Substances 

 in Pituitary Extracts, etc. Brit. Journ. Exp. Biol., 2, 427. 



Stockard (1907). Artificial Production of a Single Median Eye, etc. 



Arch. Entro. Mech., 23, 249. 

 Swingle, W. W. (1919). Studies on the Relation of lodin to the Thyroid, 



I and II. Journ. Exp. Zool., 27, 397. 



(1922). Experiments on the Metamorphosis of Neotenous Amphi- 

 bians. Journ. Exp. Zool., 36, 397. 



Uhlenhuth, E. (1921). The Internal Secretions in Growth and Develop- 

 ment of Amphibia. Amer. Nat., 55, 193. 



(1922). The Effect of Iodine and lodothyrin on the Larvae of 



Salamanders, III. Biol. Bull., 42, 143. 



