428 INJURIES OF 



own particular animal functions."" That animals should skip and 

 jump, and eat, after losing their hemispheres, is not surprising, if 

 these parts perform the phrenological functions assigned to them 

 and are not necessary to motion. The chorda oblongata and other 

 lower parts of the encephalon have, no doubt, much to do with 

 motion as well as the chorda spinalis. Accordingly, when the 

 oblongata was pressed in the child mentioned by Mr. Lawrence 

 convulsions occurred ; and the same effect ensued on irritating it, 

 in Gall's experiments and those of Lorry. Pressure of it, how- 

 ever, is also said by vivisectors to occasion stupor. 



Dr. Magendie, who cut living animals here and there with no 

 definite object, but just to see what would happen, informs us, 

 that, 



1. Deep cuts of the hemispheres do not affect motion in mam- 

 malia, reptiles, fish, and many birds, any more than their entire 

 removal : but the latter is said to occasion blindness in mammalia 

 and birds, though not in fish or frogs, probably from the arrange- 

 ment of the cerebral parts being different, so that a similar wound 

 affects different organs. Neither a longitudinal section of the 

 mesolobe, nor its removal, has any more effect on motion. 



2. If the white substance of both corpora striata is cut away 

 with the hemispheres, the animal darts forward against all objects 

 in its way, and retains the attitude of progression, if prevented. p 

 If the injury is to the grey portion, or to the white of one corpus 

 striatum only, motion is not interfered with. When a thalamus 

 was removed from a poor animal moving forwards after this mu- 

 tilation, it ceased to attempt advancing, but began to turn to 

 the corresponding side ; and, when the other thalamus was next 

 cut away, it became still, with its head inclined backwards.** M. 

 Fode>a had found that the removal of a part of the cerebellum 



n 1. c. t. iii. p. 385. sq. Dr. Vimont also conceives that the cerebellum is not 

 simple. Finding its processus vermiformis very large in climbing and remark- 

 ably sure-footed animals, he imagines that it will be found somehow connected 

 with motion. (1. c. t. ii. p. 242.) 1835. Mr. S. Solly lately stated to the 

 Royal Society that he has traced a superficial and a deep-seated layer of fibres 

 from the anterior columns of the spinal chord into the cerebellum. 



Gall, 8vo. 1. c. t. iii. p. 392. 



p Yet Drs. Foville and Pinel Grand- Champs fancied that the anterior lobes 

 and corpora striata presided over the motions of the inferior extremities ; and 

 the posterior lobes and thalami over those of the superior. 



q Report of Brit, Assoc. 1833. 



