202 



Prof. J. Burdon Sanderson. On the [May 17, 



Account of Ancient Oriental Methods in Astronomy and Mathe- 

 matics, in the Turkish Language]. Part 2. Folio. [1887]. 



H.E. Ghazi Moukhtar Pasha. 



Plantamour (Ph.) Des Mouvements Periodiques du Sol. (9e Annee.) 

 8vo. Geneve 1887. The Author. 



Schiaparelli (Gr. V.) Osservazioni Astronomiche e Fisiche del Pianeta 

 Marte (Mem. 3a). 4to. Boma 1886. The Author. 



Yelschow (F. A.) The Natural Law of Relation between Rainfall 

 and Vegetable Life and its application to Australia. 8vo. 

 London 1888. The Author. 



Wardle (T.) Royal Jubilee Exhibition, Manchester, 1887. Descrip- 

 tive Catalogue of the Silk Section. 8vo. Manchester [1888]. 



The Author. 



Weihrauch (K.) Neue Untersuchungen uber die Bessel'sche Form el 

 und deren Verwendung in der Meteorologie. 8vo. Dorpat 1888. 



The Author. 



May 17, 1888, 



Professor Gr. G. STOKES, D.C.L., President, in the Chair. 



The Presents received were laid on the table, and thanks ordered 

 for them. 



The following Papers were read : — 



I. " On the Electromotive Properties of the Leaf of Dioncea in 

 the Excited and Unexcited State. No. II." By J. Burdon 

 Sanderson, M.A., M.D., F.R.S., Professor of Physiology in 

 the University of Oxford. Received April 17, 1888. 



(Abstract.) 



The author has continued his experimental enquiries, of which the 

 results were communicated to the Royal Society under the same title 

 in 1881. In the introduction to the paper he gives a summary of his 

 previous observations, which led to the conclusion that the property, 

 by virtue of which the excitable structures of the leaf respond to 

 stimulation, is of the same nature with that possessed by the similarly- 

 endowed structures of animals. He then proceeds to state that the 

 main purpose of his subsequent investigations has been to determine 

 the relation between two sets of phenomena which might, in accord- 

 ance with the language commonly used in animal physiology, be 

 termed respectively those of the "resting current" and of the "action 



