author's abstract of this paper issued 



BT the bibliographic SERVICE, JUNE 13 



EXPERIMENTS ON THE REGENERATION OF THE 

 LENS IN DIEMYCTYLUS 



CHIKANOSUKE OGAWA 



Department of Anatomy, Kyoto University, Japan 



FOUR FIGURES 



INTRODUCTION 



In embryonic development the lens is formed from the ectoderm 

 covering the eye cup. If the larval or adult Urodele is experi- 

 mentally deprived of its lens, regeneration takes place from the 

 dorsal side of the iris, which has no relation with the normal 

 embryonic development of the lens. This striking fact of hetero- 

 morphosis, which was first discovered by Colucci,^ later led 

 many investigators^ to study this problem further from various 

 points of view. Not only have descriptions of the regular regen- 

 erating process been given in detail, but also the factors that 

 stimulate and determine the formation of the lens, the reason 

 that the seat of regeneration is exclusively in the upper iris, and 

 many other questions have been investigated. 



In the present investigation the author has studied further 

 the regular regeneration of the lens, and in relation to it has also 

 made a number of experiments upon the dorsal part of the iris 

 (upper iris). 



MATERIAL AND METHODS 



Adult specimens of Diemyctylus were used exclusively as 

 material for the present study. 



The method of operation is as follows: The whole body of 

 the animal, except the head, is wrapped in cloth. A piece of 

 cloth is put into the mouth in order to keep the eye protruded. 



1 See Emery ('97). 



2 Wolff (larva and adult of Triton taeniatus), Fischel (35-mm. long larva of 

 Salamandra maculosa), Miiller (3- to 6-cm. long larva of Triton), Wachs (larva of 

 Salamandra perspicillata, Triton taeniatus, cristatus, axolotl), etc. 



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