( 348 ) 
already by TiGeRstepr — it cannot be based solely upon the single 
series of experiments published by HERMANN, but has probably been 
deduced from several non-published series of experiments. 
Among later investigators I will only mention A. Frox +), Treen °), 
Lamansky ®%), A. B. Meyer‘). Fick arrives at the conclusion that 
with small magnitudes of stimulus, rising only very little above the 
thresholdvalue, the effect measured by the intensity of contraction, 
the load remaining constant, is pretty well proportional to the 
stimulus, but increases less rapidly afterwards. At last a maximum 
is obtained, increasing no more by any increment of stimulus. This 
result is confirmed by A. B. Meyer. 
First of all among the latest investigators, the results of whose 
researches demand a closer examination, TrGERSTEDT 5) ought to be 
mentioned, who arrives by a series of most carefully executed expe- 
riments with the aid of an unimpeachable instrumentarium, to 
the conclusion that „bei gleichférmigem Zuwachs der Stärke des 
electrischen Reizes die Muskelzuckungen zuerst schnell, dann immer 
langsamer zunehmen, um schlieszlich sich einem Maximum asymp- 
totisch zu nähern. Dieses Gesetz gilt, sowohl bei direeter Muskel- 
reizung als bei indirecter von Nerven aus, für constante und inducierte 
Ströme, in welcher Richtung sie den Nerven oder den Muskel durch- 
flieszen mögen.” 
Finally we ought to remember A. WALLER®), who also published 
a series of experiments. Although starting from the unexact 
premises, that the phsychological law of Wessr—FEcHNER prevails 
here too — with which statement however the obtained results are 
in absolute disaccordance — I believe his series to possess great im- 
portance from different points of view. Furtheron we will repeatedly 
have to quote and to examine them more closely. 
Fick’) accepted a lineal relation between feeble stimuli and the 
effect, whilst by increased stimuli no further increment of effect was 
1) A. Fick, Untersuchungen über elektrische Nervenreizung. 1864. Id, „Studien 
über elektrische Nervenreizung” in Festschrift f. E. H. WeBer. 1871. 
2) Treeer, Arbeiten aus der physiologischen Anstalt in Leipzig. X. 1875. Bericht 
der Sächsischen Gesellschaft f. Wissenschaften, Math.-Phys. Classe. 1875. 
3) Lamansky., Studien des physiologischen Instituts zu Breslau. IV. S. 220. 1868. 
4) A. B. Meyer, Untersuchungen aus dem physiologischen Laboratorium der Ziiricher 
Hochschule. I. pag. 36—50. 1369. 
5) R. Tiaprstept, Mittheilungen vom physiologischen Laboratorium des Carolinischen 
Instituts in Stockholm. 3es Heft. 1884. 
©) A. Water, Points-relating to the WEBER—FECHNER Law. Brain 1895, p. 200. 
7) L ce. pag. 14. 
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