819 



Sg. B. Immediately after tlie stimulus the after-sound, wliicli is 

 powerful and high-pitched (cricket-chirp) (duration 2'/^ sec). 



A highly powerful blowing noise in conjunction with the after- 

 sound and continuing when this has ceased. With one exception 

 (15.5 sec.) it continues for 3 — 7 sec, to be succeeded by a gap of 

 absolute or relative silence (2 — 10 sec). Subsequently a second 

 discontinuous blowing noise is distinguisiied, sligluly differing in 

 character from tlie first. The intervals are characterized by a slowly 

 increasing murmur. The second blowing noise disappears entirely 

 only after 15 — 40 sec. In the end the normal noises return while 

 intensifying gradually. 



M. Immediately when the stimulus is emitted a blowing noise is 

 plainly audible, which especially in its inilial phase, assumes a certain 

 pitch (higher than cj. The intensity of (he noise lessens rapidly ; 

 after 2 or 3 sec the subject has to concentrate his attention con- 

 siderably to follow it; in 7 cases it is inaudible after 13 — 15 sec. 

 Sometimes it is not continuous; the moment of its first disappearance 

 occurs after 4 — 23 sec Usually it is superseded by the normal noises. 



Cj. M. Directly after the stimulus a typical murmur, lieaid also 

 before the experiment but less vigorously. 



In the foregoing tables we give the principal data regarding the 

 character and the duration of the phenomena as apprehended by 

 our subjects when acted upon by the stimuli applied. 



CONCLUSIONS. 



i. Invariably a constant after-sound, differing individually has been 

 observed close upon the stimulus. With the lower stimuli it consists 

 chiefly in a murmur of a certain pilch, while the latter prevails 

 before the discant. At one stage after the discant the after-sound 

 changes into a typical blowing noise. 



The most forcible after-sound is yielded by the high discant. Its 

 duration varies from 2 to 30 sec. As for the pitch of the after-sound, 

 it is constantly higher than that of the stimulus. The lowest stimuli 

 as a rule yield the lowest after-sound ; the highest are produced by 

 the highest stimuli. 



2. An interval of 2 — 30 sec is most often filled by a second 

 after-sound, 'lower than the first, mostly of longer duration and much 

 less distinguishable from the normal entotic noises. 



