68 



Messrs. Mott, Schuster, and Sherrington. [Mar. 28, 



Details of the Experiments. 



The animal was anaesthetised with chloroform and ether, and a light 

 degree of anaesthesia maintained after the brain had been exposed. 



The accompanying protocol describes the results obtained, and fig. 1 L and 

 E indicate the points of stimulation. 



Protocol of Experiments. 

 Left HemispJiere. 



Unipolar stimulation : diffuse electrode on E. foot ; small electrode (ball-pointed, ball 

 about 0'5 mm. diameter) ; stimulus in Kronecker units (K.TJ.) : — 

 500 K.U.— 



1. Movements of nostril. 



2. Retraction of lip, opening of jaw. 



3. Turning of head to opposite side. 



4. Extension of elbow. 



5. Ditto and movement of thumb. 



600 K.U. (large electrode with ring loop for application, 4 mm. in diameter) — 



6. Flexion of elbow, some retraction of shoulder. 



7. Closure of eyelids. 



8. Inward rotation of wrist, reaching forward movement from shoulder. 

 8 (again). Drawing-back movement. 



6 (again). Flexion of elbow, drawing-to of shoulder. 

 8 (again). Drop (flexion) of wrist. 



9. Extension of shoulder. 



10. Extension of shoulder, accompanied by abduction of wrist, extension of fingers, 



with a little abduction of thumb (also relaxation of biceps). 



11. Elevation of shoulder. 



12. Slight flexion of knee. 



Bipolar stimulation (stimulus value in centimetres) : — 

 9 cm. — 



13. Wrinkling of forehead. 



14. Closure of lower and upper eyelids. 



15. Forehead and nostril. 



Unipolar stimulation: diffuse electrode on L. foot ; loop electrode as before : — 

 600 K.U.— 



16. Flexion of hip. 



17. Flexion of knee and extension of toes and hallux (succeeded by flexion). 



17 (again). Flexion of knee, extension of ankle and toes, going back into flexion. 

 17 (again). Flexion of hip and knee, extension of foot and toes. 



18. Slight flexion of toes (without hallux), extension of ankle with some opening 

 {i.e. separation) of toes. 



Bipolar stimulation as before : — 



18. (again). Slight contraction of toes. 



Unipolar stimulation with fine ball-pointed electrode : — 

 17 {again )7 Extension of hip and knee, abduction of leg. 

 17 (again). Abduction. 



19. Extension of foot (very slight). 



