238 CHESTER H. HEUSER 



Finally, it should be noted that the aqueduct of Sylvius remains 

 as a distinct ventricle of the mid-brain in the adult pig. One 

 of Retzius's figures alone gives a good lateral view of the mid- 

 brain of man. This he described as 'ventriculus mesencephali.' 

 The cavity of the mid-brain in the horse stands out also as a 

 distinct ventricle. In the pig the mid-brain has throughout 

 development and in the adult a well defined ventricle which 

 constantly increases in size as long as the brain grows. 



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