742 Dynamic Theory. 



tract of the left side had undergone secondary degeneration, and with it 

 the right middle peduncle and right lobe of the cerebellum had become 

 greatly reduced." ( Ferrier.) 



FIG. 376. 



FIG. 376 Same brain shown in fig. 375, seen here from the left side. 

 A. Right hemisphere. B. Atrophied Left hemisphere. 



" It is stated by Foville that in acute cases of insanity he has usually 

 found the cortical substance intensely red, but without adhesion to the 

 membranes, whilst in chronic cases it is indurated and adherent ; but 

 where the insanity has been complicated with paralysis, he has usually 

 found the medullary (fibrous) portion indurated and congested." (Car- 

 penter. ) 



Dr. Brown-Sequard, in experimenting with guinea-pigs, discovered 

 that after he had injured the spinal cord in a particular manner, he 

 could produce epileptic convulsions by slightly pinching the skin of the 

 animal's face. After the lesion in the spinal cord was healed in these 

 guinea-pigs, the tendency to epilepsy remained, and it was transmitted 

 to their offspring. This experiment was unsuccessful with any other 

 animals except guinea-pigs. 



Epilepsy is a disease which affects the centers of the internal senses. 

 Precisely what this disease is due to is not known, probably overstim- 

 ulation and consequent weakening of some part of the nervous centers. 

 It weakens the memory, and may efface the conscience. It is apt to 

 engender a tendency to be suspicious and distrustful, surly, irascible 

 and indolent. These changes are generally temporary, but sometimes, 

 and especially in children, the moral character is permanently impaired." 

 (See Maudsley.) Acute mania may produce similar effects on the moral 

 nature. 



Hemiplegic paralysis is usually attributable to some structural disor- 

 ganization of the nervous tissues of the sensory centers (optic thalami, 

 &c. ), produced by hemorrhage, softening, &c. Sometimes, however, it 

 is due to deteriorization, or poisoning of the blood, or its deficiency of 

 nutritive elements. A partial paralysis results from the presence of 



