[mills] functional DEVELOPMENT OF CEKEBRAL CORTEX 11 



ill til is case all the conditions are favourable for a clear judgment. The cortex 

 is removed over a large area around the crucial sulcus. On using the same 

 current the movements are produced more readily than when the cortex is 

 stimulated. When the current is increased in strength there is a tendency to 

 movement of both fore-legs. Can get only three distinct movements of the 

 fore-legs before exhaustion sets in ; the same applies to the hind leg. 



Case VIII.— A'^Y^é-n; Sth to 9th doy.— Eyes unopened. Ether. 



With current C get on stimulation of definite regions around the crucial 



sulcus movements of the fore-leg and the hind-leg. In this case there seems 



to be distinct localization. On cutting away the cortex in this region get 



similar results. These results are very transient, exhaustion soon setting in. 



Case YK..— Kitten; 9t1h day. — Eyes unopened. Ether. 



No certain positive results with any current. The same applies to the 

 medulla, though I get the impression that movements are incipient, so to 

 speak. 

 Case X.— Kitten ; 9th rfai/.— Eyes opening. Ether. 



With current C get movement of both fore-legs. Later, with current B, 

 one only moves, but most distinctly. After removal of the cortex around the 

 crucial sulcus for some considerable distance, stimulation results in the same 

 movement. 



In this case the wound is closed ; some antiseptic precautions. Movements 

 on recovery fi-om anivsthesia much, if not quite, as before ; no clear evidence 

 of any unilateral weakness. 

 Case ^l.— Kitten ; 10th to 11th rfoy,— Eyes open. Ether. 



With currents B, C and D movement of the fore-leg, and some\\ hat better 

 with the stronger currents. 



On removal of the cortex, the movements of the fore-leg are very marked, 

 of the hind-limb less so. 

 Case XII.— Kitten ; 11th day.— Eyes open. Ether. 



With current B movement of the fore-leg; with current C get movement 

 of the hind-leg and both fore-legs, but the movement on the opposite side is 

 much more pronounced. A distinct advance in the character of the fore-leg 

 movement as compared with any yet noticed ; the response is more prompt 

 and the movement more elaborate and perfect in every way. 

 Case XIll.— Kitten ; ISth or 14th day. — Eyes open. Ether. 



With current B, movement of the fore-leg and later of the hind-leg on 

 stimulation of différent areas ; with current C, both fore- and hind-legs move 

 together; but there is localization, and the area for the fore-leg seems to be 

 more readily roused to action and the most resisting. 

 Case XIY.— Kitten ; 14th or loth rfay.— Eyes open . Ether. 



Get movement of fore-leg with much weaker current than hitherto gave 

 positive results, viz., with current A. To get movement of the hind-leg a 

 stronger current must be used. On using a very strong current (D), a-et move- 

 ment of both fore-legs. 



Eemarks on the Experiments on Cats. 



Tlie first case is givon as an example of what I have invariably 

 found — tliut in very young cats both cortex and medulla are absolutely 

 inexcitable, no matter what the strength of the current employed. 



In Case II., though the cat is only six days old and the eyes un- 

 opened, with a strong current movements of the fore-leg are produced, 

 and these are repeated a good many times — in fact, a great number, 



