Herrick, Cortical Motor Centres. 93 



sity, V. 1890.^ The paragraphs immediately germain are the 

 following : 



"Previous to the sectioning, as already said, several localiza- 

 tion experiments were made both by electrical stimulation and 

 extirpation. The first specimen was a male of Arctoinys monax, 

 the same specimen which furnished the sections most frequently 

 described and figured beyond. Ether was employed as an an- 

 esthetic, and the skin was parted down the median line of the 

 head and the skull removed over the anterior and middle parts 

 of the left hemisphere. The current used was from one Grove cell 

 and was just enough to operate the induction coil, producing an 

 irritation easily endured by the tongue. When the electrodes 

 were introduced at a. Fig. 4, Plate V (at about the anterior 

 one-third, near the median line and corresponding approximately 

 to Munk's region C of the dog) a forward and outward motion 

 of the right fore leg was produced. A stronger current pro- 

 duced an an electro-tonic contraction of the muscles of the 

 whole right side. At the point b, about 5 mm. behind and a 

 little outward from the above (corresponding to about the pos- 

 terior margin of Munk's region D), the stimulus produced a 

 straightening of the right hind leg. At the point e, about 8 

 mm. behind b, and near the median fissure (corresponding to 

 about Munk's region F, near the median line), the stimulation 

 resulted in a sharp contraction of the orbicularis palpebrarum 

 and orbicularis oris of the right side and some feeble contrac- 

 tion of the facial muscles of the left side, probably due to super- 

 ficial irradiation. 



"At the point d, about 8 mm. behind c, and farther from 

 the median fissure (corresponding to the anterior margin of 

 Munk's region A), the insertion of the electrodes produces no 

 motor disturbances nor did any point back of d. By a series 

 of trials it was found that the electrodes produced some motor 

 disturbance of the fore leg at all points within the area marked 

 A, but not beyond it. 



"The area B likewise marks about the hmits of the hind leg 



' The Central Nervous System of Rodents, etc. 



