Scientific Proceedings (76). 



that the pigment of these eyes undergoes a decided forward move- 

 ment when the animals are transferred from darkness to light. 

 In darkness most of the pigment is massed near the base of the 

 epithelial cells, and only comparatively few needles extend into 

 the protoplasmic processes between the visual cells. In light a 

 decidedly greater amount of pigment moves toward the external 

 limiting membrane so that the basal layer is thinner. Measure- 

 ments of the distance from the external limiting membrane to the 

 nearest pigment needle (or from the choroid edge of the epithelial 

 cells to the farthest pigment needle) are practically the same in 

 light and dark eyes, so that this kind of measurement gives no 

 indication of the extent of movement of the pigment. 



The cones in the light eye are 4.2 ju shorter than those in the 

 dark eye, the total expanded length of the cones being 25 /x. The 

 rods seem to be longer in the light eyes than in the dark, but the 

 increase is too slight to permit of satisfactory measurement. 



Optic cups were transplanted at the tail bud stage to various 

 parts of the body, where they developed to form more or less 

 perfect eyes. The region of the auditory vesicle seemed to offer 

 a particularly advantageous spot for the transplant. In the 

 transplanted eyes the movement of the pigment is fully as great 

 as in the normal eyes. The cones also contract in the light but 

 only to the extent of about 2.5 it. 



Pigment migration and cone contraction therefore do take 

 place in a Urodele retina and can do so independently of the cen- 

 tral nervous system. 



106 (1170) 



The alleged exhaustion of the epinephrin store in the adrenal by 

 emotional disturbance. 



By G. N. Stewart and J. M. Rogoff. 



[From the H. K. dishing Laboratory of Experimental Medicine of 

 Western Reserve University.] 



1. It has been stated that a marked diminution in the store of 

 epinephrin in the adrenal gland is associated with various kinds of 

 emotional excitation. Thus Elliott 1 speaks of morphin-" fright" 

 in cats causing exhaustion of a gland whose splanchnic nerve 



1 Journal of Physiology, 1912, 44, p. 374. 



