312 



Presents. 



[Mar. 12, 



From which, the conclusion is drawn that: — Tetanisation is at- 

 tended with an evolution of C0 2 within the nerve. 



4. Theoretical Considerations. 



Phenomena of summation. Staircase phenomena. The possible 

 nature of positive after-effects and of positive effects. 



Phenomena associated with polarisation effects in nerve, and their 

 modification by anaesthetics. Electrotonic currents and their nega- 

 tive variation. Polarising currents and their positive variation. 



What is the possible mechanism of the positive and negative effects 

 of the electrical excitation of medullated nerve ? 



What are the possible functional and chemical relations between 

 the grey axis and the white sheath of a medullated fibre ? 



Presents, March 12, 1896. 



Transactions. 



Berlin: — K. Preuss. Akademie der Wissenschaften. Sitzungs- 

 berichte. 1895. Nos. 39—53. 8vo. Berlin. 



The Academy. 



Chapel Hill: — Elisha Mitchell Scientific Society. Journal. Vol. 



XII. Part 1. 8vo. Chapel Rill 1895. The Society. 



Eastbourne : — Natural History Society. Transactions. Vol. III. 



Part 1. 8vo. Eastbourne [1896]. The Society. 



Frankfort- on- the- Main : — SenckeiLbergische Naturforschende Gre- 



sellschaft, Abhandlungen. Bd, XIX. Heft 3—4. 4to. 



Frankfurt-a-M. 1896. The Society. 



Kew: — Royal Gardens. Bulletin of Miscellaneous Information. 



February, 1896. 8vo. London. The Director. 



La Plata: — Museo de la Plata. Anales : Seccion Zoologica. Nos. 



2—3. Folio. La Plata 1895 ; Revista, Tomo VII. Parte 1. 



8vo. La Plata 1895. The Museum. 



London: — British Museum. Catalogue of Printed Books. Rome. 



Sav-Scha. Scha-Schi. Sclu-Schm. Scho-Schr. Folio. 



London 1896. The Trustees. 



Linnean Society. Journal (Zoology). Vol. XXV. No. 162. 



8vo. London 1896. The Society. 



Marine Biological Association. Journal. Vol. IV. No. 2. 8vo. 



Plymouth 1896. The Association. 



Royal Meteorological Society. Quarterly Journal. Vol. XXII. 



No. 97. 8vc. London 1896 ; List of Fellows. 1896. 8vo. 



London. The Society, 



