815 



niurmur with pitch (± Cjj. Both tone and murmnr soon get weaker 

 and weaker; when they have disappeared the normal noises are heard. 

 _f\ B. Tiie after-sound is very foi'cibie and high; its 4ime averages 

 174 sec. It always makes way for a musical sound of a pitch lying 

 between tiiat of after-sound and stimulus. Its intensity lessens 

 gradually, so that finally (in 3 cases after 4, 7 and 207j min.) an 

 absolute or relative silence ensues. This interval lasts about 6 sec, 

 after which not the normal noises are perceived, but again a musical 

 sound whose length varies from 7 to 18 sec. and with which the 

 gradually reinforced normal noises coalesce, while being interrupted 

 every now^ and then by feeble bird's notes. Ultimately the musical 

 tone flows together with the normal noises. 



M. Only rarely does the subject observe a murmur with pitch 

 directly after the emission of the stimulus. While maintaining its 

 pitch (± f's) till the end it gets gradually fainter and finally makes 

 way for the normal noises. Oftenest, however, the subject observes 

 instantly after the stimulus a powerful, highpitched tone (6th Octave) 

 of fairly long duration (7 — 9 sec), fading away slowly. In the end 

 the normal noises return. 



a^ B. The after-sound heard directly after the stimulus, is high 

 and powerful; its duration averages ± 17^ sec. In well nigh all 

 cases it is succeeded by a musical sound of a pilch lying between 

 that of the after-sound and the stimulus and of a duration varying 

 from 2 to 4 sec. This sound makes way for a period of absolute 

 or relative silence, which is gradually filled by intensilied normal 

 noises. 



M. In 17 out of 20 cases a tone is heard instantly after the 

 stimulus is emitted. It gradually swells up to a maximum, reached 

 after 2 or 3 seconds. Then the tone dies out very slowly. Its pitch 

 is about that of the stimulus. Its length is considerable (21 — 63 sec.) 

 When lasting very long there is sometimes a breach of continuity; 

 it is plainly audible, though it is, of course, comparatively feeble. 

 When discontinuous it sounds like a succession of pulsations of the 

 same periodicity with those observed by the subject when not ex- 

 perimented upon. In the end there is a recurrence of the ordinary 

 entotic noises. 



In 3 cases the subject is for about 20 — 58 sec. conscious of a 

 powerful, typical blowing noi.se immediately after the stimulus issues 

 from the whistle. It is discontinuous at rather regular intervals 

 and makes way for the normal noises, in which it nmy be distin- 

 guished a few times. 



t/j B. The after-sound is very high and powerful : its time averages 



