152 AGEING OF THE EGG AND DEVELOPMENT 



BEFERENCES: 



Blandau, E. J. 8e W. C. Young, 1959 - "The effects of delayed fertilization on the develop- 

 ment of the Guinea Pig ovoue. " Am. Jour. Anat. 6k: 



Brlggs, B. W., 19'*-1 - "The development of abnormal growths in Bana pipiens embryos follow- 

 ing delayed fertilization." Anat. Bee. 81:121. 



Dalcq, A. M., 1958 - "Form and Causality in Early Development." Cambridge Univ. Press. 



Hertwig, B. , 1925 - "Uber experimentelle Geschlechtsbestimmung bei Froschen." Sitzber. 

 der math.-natur. Abt. der Bayer. Akad. der Wiss. Jahrgang, 1925. 



Holtfreter, J., 19't-5 - "Properties and functions of the surface coat in Amphibian embryos.' 

 Jour. Exp. Zool. 95:251. 



Lehmann, F. , 1957 - "Die Wlrkung chemischer Factoren in die Embryonalentwicklung." Eev. 

 Suisse de Zool. 1+U:1. 



Morgan, T. H. , I926 - "The Theory of the Gene." p. 262, Columbia Univ. Press. 



Witechi, E., I92I - "Development of the gonads and transformation of sex in the frog." 

 Am. Naturalist, 55- 



Witachi, E. , 195'4- - "Appearance of accessory 'Organizers' in over ripe eggs of the frog." 

 Proc. Soc. Exp. Biol. & Med. 51:Ul9. 



Zimmerman, L. & E. Rugh, 19^1 - "Effect of age on the development of the egg of the leop- 

 ard frog, Bana pipiens." Jour. Morph. 68:529- 



Zorzoli, A. & B. Sugh, 19i+l - "Parthenogenetic stimulation of aged Anioran eggs." Proc. 

 Soc. Exp. Biol. & Med. l4-7:l66. 



"Science does not explain anything .... Science is 

 less pretentious. All that falls within its mission is to 

 observe phenomena and to describe them and the relations be- 

 tween them. " 



A. J. Lotka 1925 



