58 Journal of Comparative Neurology. 



Introduction. 



The specimen was from a young male pup twenty five 

 inches in length, weighing about twelve pounds. The brain 

 was still incased in the dura and on the basal surface portions 

 of the cranial bones were left adherent to this membrane. An 

 occasional cut through the dura caused a protrusion or hernia 

 of the cerebral substance. 



The weight of the brain in the fresh condition, as reported 

 by Mr. Lucas, was ten ounces and two hundred and forty 

 grains. This included the dura with the attached cranial 

 fragments. 



The specimen was preserved in a "rather strong solution 

 of formalin" and except for some swelling of the tissue and soft- 

 ening of the interior was in a very good condition. The bloat- 

 ing was indicated by the increased weight which, immediatly 

 after the receipt of the specimen, Dec. 12, '96 was found to be 

 13 ounces, a gain of nearly three ounces, by the closure of the 

 fissures and by the cerebral hernias. The weight without dura and 

 attached fragments of cranial bones after preservation from Sep. 

 I to Dec. 12 was g]4 ounces and 80 grains (avoir.). The lat- 

 eral girth was 26 centimeters, the longitudinal girth with the 

 oblongata cut off at an even level with the caudal surface of the 

 cerebellum was 24 centimeters, being slightly less than the 

 former. This may, perhaps, be accounted for, to some extent, 

 by the tape resting slightly in the inter-cerebral cleft, and to the 

 bloating, as this would affect the lateral rather than the longi- 

 tudinal circumference. 



The brain as indicated by the girth measurements was of a 

 subglobular form slightly tapering at the ends and its outer sub- 

 stance though firm was not unyielding. Twenty four hours 

 immersion in gS% ''^^chol served to contract the nervous tissue 

 sufficiently to open the fissures and yet to retain enough flexi- 

 bility of their walls to permit of an easy examination of their 



