( 129 ) 



In this quiet half-sleep we see what follows: 



Towards the end of the respiration, which has become calm, the 

 pulsations are of a long duration. When the inspiration begins, they 

 are shorter. Towards the end of the inspiration and during the 

 beginning of the expiration the pulsations are at the quickest. 



When the expiration has reached its maximum, they are very long; 

 the same thing begins over again just before or after the beginning 

 of the inspiration. 



It is not necessary to dwell on the influence of the respira- 

 tion on the duration of the pulse and the pressure of the 

 blood, which is fairly well-known. It appears, however, also, that 

 the duration of the pulse varies at irregular intervals. Independently 

 of the respiration, which never loses its influence, the pulsations 

 become quicker or slower at irregular periods. These particularities 

 must not be overlooked. 



When we have registered long enough to have a sufficiently trust- 

 worthy starting-curve (see fig. Til) in half-sleep, a number is called 

 out to the person. Even if he does not calculate, this call is sufficient 

 to bring about a slight, passing acceleration of the pulse. If howe- 

 ver, he calculates, the acceleration sets in at once. It increases, 

 according to the increase of exertion. When after half a minute 

 the signal „stop" is given, the acceleration of the pulse coutinues 

 for some seconds. After that, a shorter or longer amphibole stadium 

 follows, in which there is neither acceleration nor retardation. Finally 



Fig. V. Tliree series of pulsations one nbove the otlier. 

 In all three : a. is the pulsation of the arteria radialis. 



h. is the tuning-fork of 2 vibrations per second. 

 The lowest series, with 28 pulsations in 20 seconds before , 



The middle series, with 29 pulsations in 20 seconds during [ the sum. 



The highest series, with 25 pulsations in 20 seconds after ' 



(J. BE Vye, April 1S98. Reduced to '/a of its size by means of piiotogruphy.) 



