816 



± IVs !^ec. The subject often announces a regularly recurring 

 intense strain, wliicli vanishes by slow degrees. In 11 out of 12 

 cases the after-sound is succeeded hy a pause of absolute or relative 

 silence. In about half the ca.ses it lasts 13— d 7 sec. when it is 

 fdJed b^- tlie gradually intensifying murmur. In the remaining 

 cases this pause is much shorter (8 — 10 sec.) and is filled not by 

 the normal noises, but by a second after-sound, a continuous tone 

 lasting ± 7 — 10 sec. and fading before the gradually intensifying 

 normal noises. In only one case does the second after-sound follow 

 the first immediately. Its pitch is lower than that of the first. 



M. Close upon the issue of the stimulus a rapid tone, gradually 

 growing less intense, lying somewhere about a^. In well-nigh every 

 case it is succeeded by a vigorous blowing noise, which lasts from 

 65 — 93 see; the maximum of intensity is reached after 2V, — 3 sec. ; 

 then it fades away exiiemely slowly and regularly. Sometimes it 

 recurs once or twice. In synchronism with this blowing noise pul- 

 sations are audible, weak as compared with the force of the blowing 

 noise (pitch ± a,). 



f\. B. The average duration of the after-sound, appearing at the 

 emission of the stimulus, is 2 sec. It is high (cricket-chirp), vigor- 

 ous, often extremely so. It is constantlj succeeded b^' a period of 

 absolute or relative silence, (5 — 16 sec); in this pause a strong sen- 

 sation of strain is often perceived. In some cases a second after- 

 sound is heard after the first, lower but of longer duration (3 — 7 

 sec). In the majority of cases the pause is filled by gradually intensi- 

 fying normal noises broken by a few bird's notes. 



M. In some cases directly after the emission of the stimulus a 

 high-pitched tone, followed immediately by a typical, continuous 

 blowing noise ^duration 69 — 87 sec). Mostly this noise is heard 

 close upon the stimulus. It is very powerful, sometimes with pitch 

 especially at the beginning. At times it is interrupted by the ordi- 

 nary pulsations. Finally the normal murmur i-efurns. 



a^. B. The after-sound is comparatively long (± 3 sec), powerful 

 and high-pitched (cricket-chirp) and seems to follow the stimulus 

 immediately. In most cases it is succeeded by a period of absolute 

 or relative silence (3 -1272 s<e/.), In one third of the cases, however, 

 the normal noises recur, either to continue with growing intensity, 

 or to make way for a second after-sound, most often a musical 

 sound lower and feebler than the first. 



This after-sound covers about 4 — 13 sec. Ultimately it is also 

 replaced by the gradually intensifying normal noises. 



M. Only in one of the 10 cases does the subject announce a short 



