96 INSECT PHYSIOLOGY 



necessary for growth and moulting : if the brain from a lepidopterous 

 pupa which is just coming out of diapause after exposure to a period 

 of chilling, is implanted into a pupa that is still in diapause, this pupa 

 will resume its development. Exactly how the seasonal changes in 

 the environment bring about these effects is not known. In the case 

 of the silkworm there is a secretory centre in the suboesophageal 

 ganglion which liberates a 'diapause factor' which in turn influences 

 the developing eggs so that they become hibernating or diapause 

 eggs. 



BIBLIOGRAPHY 



bodenstein, d. Insect Physiology (K. D. Roeder, Ed.), Wiley, New York, 

 1953, 780-821 (control of embryonic development); 822-865 (post 

 embryonic development and differentiation); 866-878 (regenera- 

 tion); 879-932 (control of moulting and metamorphosis) 



crew, f. a. e. Sex-determination, Methuen's Biological Monographs, 

 London, 1954 



danilevskii, a. s. Photoperiodism and Seasonal Development of Insects, 

 Oliver and Boyd, Edinburgh & London, 1965, pp. 283 



gilbert, l. I. Physiology of Insects I (Morris Rockstein, Ed.) Academic 

 Press, New York, 1964, 149-225 (hormones and growth) 



Kennedy, J. s. (Ed.) Insect Polymorphism. Symposium No. 1 (1961) Roy. 

 Ent. Soc. Lond. 



lees, a. d. The Physiology of Diapause in Arthropods, Cambridge University 

 Press, 1955 



wigglesworth, v. b. The Physiology of Insect Metamorphosis, Cambridge 

 University Press, 1954, 152 pp. 



Adv. Insect Physiol., 2, (1964), 243-332 (hormones and insect growth: 



review) 



The Principles of Insect Physiology , 6th Edn., Methuen, London, 1965, 



1-24 (development in the egg); 54-128 (moulting, metamorphosis, 

 polymorphism, regeneration, diapause, etc.) 



wilde, j. de, Ann. Rev. Entom., 7, (1962), 1-26 (photoperiodism in insects: 

 review) 



