Proceedings Am. Philos. Soc. Vol. LI. No. 204 



Plate I 



Normal Rabbit : Cerebrum. 



F"riglitened Rabbit : Cerebrum. The rabbit was frightened once and immediatelv 

 killed. Note the hyperchromatism. 



Frightened Rabbit : Cerebrum. The rabbit was frightened once and killed at the 

 end of six hours. The cells are more swollen than in the normal. 



Feak in Rakbits. 



These and the following cuts are intended to show that fear and exophthalmic goitre 

 cause demonstrable morphologic changes in the nerve cells of different parts of the brain 

 which vary in degree [rather than in specificity] according to the part of the brain. 



The rabbits used in the fear experiments were frightened by dog%7vithout being injured 

 or without making muscular efforts of any consequence. 



