PHILOSOPHICAL SOCIETY OF WASHINGTON. 81 



14 L. Hermann — Weitere Unters. zur Phys. der Muskeln und Nerven, Berlin, 

 1867; also Handb. der Phys., Bd. I, Th. 1, Leipsic, 1879, S. 192 et seq. 



15 Hermannn — //audi, der Phys., Bd. I, Th. 1, S. 215. 

 16 Engelmann — Pfliiger's Archiv, Bd. XV, 1877, S. 116 et seq. 



17 Du Bois-Reymond — Ges. Abhandl., Bd. II, S. 319 et seq. 



18 Mayer — Miiller's Archiv, 1854, S. 214; Amici (1858) — Translation in Vir- 

 chow's Archiv, Bd. XVI, 1859, S. 414. 



19 Schwann — in Miiller's Handb. der Phys., 1837, Bd. II, S. 59. 



20 C. B. Radcliffe — Dynamics of A r erve and Muscle, London, 1871. 



21 Matteucci — Lectures on the Physical Phenomena of Living Beings, (trans- 

 lated by J. Pereira,) London, 1847, P- 333- 



22 Arthur Gamgee — A Text Book of the Phys. Chemistry of the Animal 

 Body, Vol. I, London, 1881, p. 418. 



23 L. Hermann — Grtmdriss der Phys. des Menschen, 5te Aufl., 1874, S. 231. 

 2 *Du Bois-Reymond— Ges. Abh., Bd. II, S. 320. 



25 Foster — op. cit., p. 79 et seq. 



26 C. A. Hausen — JVovi profectus in historia electricitatis, Leipsic, 1743. I 

 cite from Du Bois-Reymond — Unters. iiber thierische Elektricitat, Bd. II, Berlin, 

 1849, Th. 1, S. 211. 



27 Du Bois-Reymond— Ges. Abh., Bd. II, S. 250. 



28 Bernstein— op. cit., supra. 



29 Hermann — loc. cit., note 1 *, supra ; also Handb. der Phys., Bd. II, Th. I, 

 Leipsic, 1879, S. 144 et seq. 



30 See especially Du Bois-Reymond — Unters., Bd. II, Th. 1, S. 289, and 

 Pfluger— Unters. iiber die Physiologie des Electrotonus, Berlin, 1859 : An ex- 

 cellent summary of the observations (with the literature) is given by Hermann — 

 Handb. der Physiologie, Bd. II, Th. 1, S. 157 et seq. 



31 Radcliffe — p. 74 et seq., op. cit., supra. 



32 A. VON Haller— Elementa Physiologic, Lib. X, Sect. VIII, \ 15, T. IV, 

 Lausanne, 1762, p. 380. He cites as authority the essay of Le Cat, crowned by 

 the Berlin Academy in 1753. [We have in the S. G. O. Library the Berlin 

 edition of 1765, Traite de Vexistence, etc., dufluide des nerfs, etc.~\ 



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