( 135 ) 



changes cannot be regarded as consequences of changes of respiration. 



In fact, leaving the periferie contraction of the vessels out of 

 account, there is much to be said in favour of this conception. 

 Inspiration and acceleration of the pulse, expiration and retardation 

 of the pulse belong together and it is scarcely possible that the 

 tendency to inspiration should not be accompanied by acceleration 

 of pulsation during the sum, whereas the long respirations after it 

 must be attended by retardation. As to the stretching of the muscles 

 of hand and neck, every one can observe in himself, that a strong 

 inspiration is attended by these movements. 



So my exposition comes to this, that the popular saying that one 

 who listens very attentively, listens with suspended breath is not a 

 very incorrect expression. I know, however, very well, that the 

 movements here described, are not the only things, which happen 

 during the exertion of attention. 



§ IV. All the movements described here, may he brought 



about experimentallij by stimulating a certain area 



of the cortex of dog's brains by means of 



an induction current. 



Wiicn we try to find out whether the movements mentioned above 

 can be brought about experimentally, it is obvious, that we must 

 turn to the cortex of the frontal lobe of the brain. We are brought 

 to this on clinical grounds. Patients suffering of the cortex of the 

 frontal lobe on both sides show an inability of detaining an image ; 

 they are often confused maniacs ; they are so no less by their 

 inability of remembering events. Both phenomena point to a marked 

 disturbance in the power of apperception. 



I began therefore a methodical investigation with Mr. Wl\rdi 

 Beckmax who will discuss the literature ') on this subject and a 

 number of details of the experiments. The question was, whether 

 the functions of respiration could be modified by stimulation of 

 the cortex of the frontal lobe of a dog's brain. 



To this purpose the cortex was stimulated with a secondary induc- 

 tion current with electrodes, at a distance of two mM. from one another. 



Four Leclanche-cells feed the induction coil, a sledge of Dc-Bois 

 Ret.moxd, and the current can be scarcely felt on the tip of the 



*) I leave it to Mr. Würdi Beckmax to point out the agreement and tlie diffe- 

 rences of our results with tlie investigations of HrrziG, Monk, Kbaise, Se51on, 

 HoKSLEY and Spencer. 



10* 



