74 



HENRY LAURENS AND J. W. WILLIAMS 



First as regards changes in the position of the pigment in the 

 epitheUal cells. Angelucci (78) and van Genderen Stort ('86 

 and '87 b) both describe it as taking place in the eye of Triton. 

 Garten ('07, p. 20, figs. 7 and 8) shows- quite a decided dif- 

 ference in the position of the pigment in light and dark eyes, 

 although he states that it is much less extensive than in many 

 other vertebrates, and that the pigment, even in the dark eye 







Fig. B A section of a transplanted eye. Note the small number of ganglion 

 cells. 



reaches down to the ellipsoids (p. 70). Howard ('08) observed 

 pigment migration in the eye of Necturus which Arey ('16 a) 

 found to amount to about 8 /x. 



As regards the inner segment of the cones van Genderen 

 Stort ('87 a) described and figured a shortening caused by light 

 in the eye of Triton, and Angelucci ('94) claimed that in the eye 

 of the salamander the cones stretched in darkness, an obser- 

 vation which Garten ('07, p. 32) was not able to substantiate. 



