207 



apparatus, which usually pass the current in alternate direc- 

 tions, but may be made to act in the same manner as the 

 above. On the whole, the galvanic apparatus above described, 

 possessed many advantages, and was perfectly efficient as a 

 therapeutic agent. 



Eleventh Meeting — March 24, 1851. 



J. B. YATES, Esq., in the Chair. 



Mr. Alpeed Lafone, was elected an Ordinary Member, 

 and Dr. Johnston, Berwick-upon-Tweed, was chosen a Cor- 

 responding Member of the Society. 



Mr. Jacob forwarded for exhibition several beautiful casts 

 of Natural History objects in " fictile ivory," — a composition 

 of plaster-of-Paris, silica, and stearine, — and an electrotype 

 copy of a bust in the British Museum. The models from the 

 living animals are taken under the anaesthetic influence of 

 chloroform; the plaster hardens before consciousness is re- 

 stored, and the animal suffers no injury by the process; 

 copper is then deposited within the mould, and this serves 

 as the permanent pattern to cast from. An elastic mould 

 is then prepared, and from it the "fictile ivor/' forms are 

 produced. 



The President exhibited, and presented to the Society, 

 in the name of his brother, James Yates, Esq., E^S/.S., etc., etc., 

 a superb plaster model of the cone of the EncephalartM 

 Caffer, which plant recently flowered at Chatsworth, under 

 the name Zamia Caffra. 



The model, though large, was not half the size of the cone 



