264 COMPARATIVE PHYSIOLOGY OF THE BRAIN 



servations of Goltz indicate a connection of the main 

 regions of the cerebral hemispheres with certain 

 regions in the medulla oblongata. A dog that has 

 lost the anterior halves of both cerebral hemispheres 

 has a tendency to run with its head bent down. A 

 dog which has lost the posterior halves of both hemi- 

 spheres shows the opposite tendency. It moves very 

 little and its head is carried high in the air. Its an- 

 terior legs are stiff and often stretched forward. The 

 difference in the position and progressive motions of 

 these two animals seems to be somewhat similar to the 

 difference in the attitude of an Amblystoma when 

 stimulated by constant currents. The position of 

 the dog in which the anterior halves of the cerebral 

 hemispheres are removed resembles that of an Am- 

 blystoma in a descending current, while the attitude 

 of the dog without the occipital halves of the hemi- 

 spheres is like that of an Amblystoma in an ascending 

 current. (See Chapter XI.) If in a dog one cerebral 

 hemisphere be removed, while the other is intact, the 

 dog makes circus-motions toward the injured side. 

 There is an unmistakable analogy between these ob- 

 servations and the older experiments of Magendie 

 and Flourens on the sectioning of the crura cerebelli. 

 While dogs after the loss of the anterior halves of 

 the cerebral hemispheres often become irritable and 

 ugly, dogs which lose the occipital halves of both 

 hemispheres invariably become good-natured and 

 harmless. This indicates a connection of the cerebral 

 hemispheres with organs of the body for which with 



