8J4 



times it is followed hy a feeble musical tone (37, — 4 sec.)- Then a 

 period of ai)soIiirc or relative silence sets in. In almost all cases 

 this "dark" interval commences immediately when the after-sound 

 has ceased: it lakes IS'/a — 207, sec. Then the normal noises recur, 

 gradually intensified. Feeble bird's notes of distinctly varying pitch 

 often mingle with the noises at more or less regular intervals. Some- 

 times a strongly marked sensation of strain occurs in the gap of 

 absolute or comparative silence. 



M. A mnrinui' with pitch in almost all cases directly after the 

 production of the stimulus. The pitch is about l^'^ octave higher 

 than fis,. At times only a tone is heard, succeeded by a murmur 

 after 14—17 sec. 



The pitch of the tone is modified in a few cases: being rather 

 low at first, it rises up to + (/„. The intensity of tone and murmur 

 gradually lessens. The |)ulsations heard anterior to the production 

 of the stimidu.s recur during the experiment with augmented inten- 

 sity and with a decided pitch. (_)idy once or twice the subject makes 

 mention of a sensation of strain. 



<:\ B. The after-sound is short (+ 1,1 sec.}, feeble, and shrill. In 

 4 out of 6 cases it passes into a very feeble tone of different pitch 

 (lower than the after-sound, higher than the stimulus), lasting from 

 4 — 77-2 sec. A gap of absolute or relative silence immediately links 

 it.self to it. The g.ip covers 14 to 23 seconds, whereas only 13 — 15 

 seconds are taken by the "dark" interval that follows the after- 

 sound. Ultimately the normal noises return gradually with aug- 

 mented intensity, intermitted by several high and feeble musical tones. 

 In one case only a slight sensation of strain. 



M. Frequently, directly after the production of the stimulus a 

 murmur with pitch {±r^.(!.- duration 24 — 31 sec.) In a few cases 

 a pure tone is heard, which only somewhat later makes way for 

 the typical murmur, whicii in its turn passes into the normal noises, 

 broken now and again by pulsations and feeble cricket-chirps. 



L\ B. The duration of the after-sound, mostly forcible and very 

 high, .averages 2 sec. Directly after it a constantly feeble, musical 

 tone with a pitch, intermediate between that of the after-sound and 

 the stimulus. Sometimes the after-soimd coalesces with the musical 

 tone so gradually that is seems to sound musical at the outset. The 

 tone continues from 1 to 18 seconds and is succeeded by a gap of 

 absolute or relative silence lasting from 3 to 34 sec. Finally the 

 normal noises slowly return with augmenting intensity. Only once 

 a sensation of strain is- r-ecorded. 



M. Almost always directly after the emission of the stimulus a 



