1893.] Correlation of Action of Antagonistic Muscles. 417 



or merely shifted sluggishly up to the full primary position. On 

 excitation of the frontal area of the cortex of the left hemisphere 

 both eyes were directed to the right, the left eye sometimes moving 

 sluggishly as compared with the right ; after cessation of the excita- 

 tion, the right eye would frequently return at once to approximately 

 the primary median position, while the left eye did not return for a 

 considerable time, and did so in a slow unequal manner ; frequently, 

 however, both eyes remained for a long time steadily directly toward 

 the right, and under anaesthesia that seemed to be almost as frequent 

 a position for them to assume as was one approximating to the 

 median primary. When the right frontal cortex was faradised, the 

 eyes resting at the commencement of the excitation in a direction 

 towards the right, the right eye swept over sharply to the left, some- 

 times with an upward inclination also, more rarely with a down- 

 ward ; movement of the left eye invariably accompanied this move- 

 ment of the right, and with a corresponding inclination, but the 

 movement of the left eye often started late, and was almost in- 

 variably slow and feeble as compared with that of the right, and it 

 was also the more variable. When both eyes had been directed to 

 the right by excitation of the left frontal cortex, and directly after 

 the left side excitation had ceased, the right frontal cortex was 

 excited, both eyes turned toward the left, but the left eye never 

 overshot the primary median plane. When the two eyes had been 

 directed to the right by moderate faradisation of the left frontal 

 cortex, a somewhat strong faradisation of the right frontal cortex, 

 the moderate faradisation of the left side being still continued, 

 caused the left globus, and the right, to be turned toward the left, 

 but the right eye generally started earlier and moved more quickly 

 than the left, and the left, although sometimes brought up to the 

 primary position, was sometimes only slightly turned towards it.* 

 When a moderate excitation of the right frontal cortex had turned 

 the right eye to the left and brought the left to the full median 

 position, moderate faradisation of the left frontal cortex (the 

 excitation of the right side still continuing) turned the left eye to the 

 right so as to produce convergent squint ; stronger faradisation of the 

 left cortex successive to and concurrently with moderate faradisation 

 of the right directed both eyes to the right. In two instances 

 moderate excitation of the right cortex alone, near the angle of the 

 precentral sulcus, caused the right eye to be turned to the left, and 

 the left eye to be turned to the right, so that strong convergence 

 resulted. 



* A notable dilatation of both pupils sometimes occurred in this combination 

 experiment. Neither the left nor the right faradisation produced by itself any 

 dilatation of either pupil, but on the second electrodes being applied considerable 

 dilatation of both pupils followed. There was no epilepsy. 



