506 'Journal of Comparative Neurology and Psychology. 



Case 201 1. J. W.; colored; female; aged 36; dementia from tumor of the brain. Slight arterio- 

 sclerosis. The left anterior cerebral artery crossed mainly to the right through an enlarged anterior 

 communicating artery, joining with the opposite artery in a common trunk as far as the genu callosi, 

 after which this trunk sends branches to both hemispheres. From the anterior communicating artery 

 onward the left vessel is represented by a small branched vessel. 



Case 2014. E. B.; colored; female; aged 71; senile dementia. Slight arterio-sclerosis. The left 

 vertebral artery is extremely small, the posterior inferior cerebellar artery taking nearly all the blood 

 that comes through the vertebral artery. Right posterior inferior cerebellar artery very small and a 

 large vessel from the basilar takes its place. Above this vessel is the proper anterior inferior cerebellar 

 artery. Right superior cerebellar artery double. 



Case 2016. J. C; colored; female; aged 61; senile dementia. Arterio-sclerosis of the small-vessel 

 type. The anterior communicating artery has a Y-shape. Both posterior communicating arteries are 

 large and furnish the main blood supply to the posterior cerebral territory, these vessels being small. 

 Right posterior inferior cerebellar artery absent, its place being taken by branches from the anterior 

 inferior artery. 



Case 2018. J. H.; white; male; aged 76; senile dementia. Arterio-sclerosis. Right anterior 

 cerebral small; left large. On each side from the anterior cerebral artery a branch turns abruptly 

 backward and is distributed to Broca's convolution in part. The right anterior inferior cerebellar 

 artery large and supplies the posterior inferior cerebellar territory, this vessel being inadequate. 



Case 2034. A. W.; colored; male; aged 76; senile dementia. Arterio-sclerosis. Left anterior 

 cerebral artery small. Both posterior communicating arteries are very large and the corresponding 

 posterior cerebral arteries are small at their origin. Both anterior inferior cerebellar arteries are large, 

 and are sent in part to the posterior inferior cerebellar region, these vessels being rather small. Anterior 

 inferior cerebellar of right side is duplicated. 



Case 2037. M. G.; white; male; aged 74; chronic melancholia. Arterio-sclerosis. Anterior 

 cerebral of left side small. Left posterior communicating artery very large and supplies the posterior 

 cerebral region as this artery is very small. Anterior inferior cerebellar artery of right side extremely 

 small and its territory is supplied by branches from the superior cerebellar which is unusually large. 



Case 2039. J. W.; white; male; aged 50; chronic dementia. Arteries not diseased. The right 

 anterior cerebral artery is small and the main blood supply comes from the opposite vessel. The 

 anterior inferior cerebellar arteries are large and supply the posterior inferior cerebellar regions. 



Case 2041. M. H.; white; female; aged 74; chronic dementia. Arterio-sclerosis. The vertebral 

 arteries are joined by a transverse vessel about one-fourth inch from their junction with the basilar, and 

 from this vessel arises the anterior spinal artery. Left posterior communicating artery rather large. 

 Right anterior inferior cerebellar artery supplies the posterior inferior cerebellar region. 



Case 2057. A. K.; white; male; aged 77; chronic melancholia. Arterio-sclerosis. Both posterior 

 communicating arteries large; posterior cerebral arteries small. Right anterior cerebral artery large 

 and sends the main blood supply to the opposite side through a large anterior communicating artery, 

 the left anterior cerebral being very small. Anterior inferior cerebellar artery practically absent on left 

 side. (Fig. 3.) 



Case 2063. J. B. C; white; male; aged 65; senile dementia. Arterio-sclerosis. Right anterior 

 cerebral artery small at its origin; left, enlarged and sends the main blood current to the right side 

 through a large anterior communicating artery. Left vertebral artery very small, right unusually large 

 and enters without change of caliber into the basilar. (Fig. 3.) 



Case 2066. L. D.; colored; male; aged 34; paresis. Slight arterio-sclerosis. Left anterior cerebral 

 artery large and furnishes the opposite side with blood through a large anterior communicating artery, 

 the right anterior cerebral being very small at its first part. Left vertebral artery small; right about the 

 size of the basilar. (Fig. 4.) 



Case 2070. C. J.; colored; female; aged 57; chronic dementia. Arterio-sclerosis. Anterior 

 communicating artery double and from the anterior vessel arises a large artery which supplies the corpus 

 callosum — a median anterior cerebral. Both posterior communicating arteries are very large, and the 

 posterior cerebrals are very small. 



Case 2073. A. S.; colored; male; aged 25; dementia praecox. No disease of arteries. Left anterior 

 cerebral artery small and distributed mainly to the inferior surface of the frontal lobe; right artery forms 

 a large trunk which divides an inch posterior to the genu of the callosum and is distributed as usual. 

 Left posterior communicating artery rather large. (Fig. 4.) 



Case 2077. A. M. M.; colored; female; aged 72; senile dementia. Arterio-sclerosis. Right 

 anterior cerebral artery small; anterior communicating artery also small; left anterior cerebral artery 

 forms a large trunk which extends as far as the genu callosi where it divides into two large branches, 

 one of which supplies each median surface. Both posterior communicating arteries are large; posterior 

 cerebral arteries small. (Fig. 4.) 



