On the Action of Anaesthetics on Protoplasm, 



215 



Experiments V, VI, and VII. 



Action of Carbon Dioxide, of Ether, and of Chloroform upon 

 Vegetable and Animal Protoplasm. 



A. 6. 



Movements of Elodea. C&nadensis. Mobility of nerve of Rana. Temporasia,. 



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7 & 9 IO II IS 13 14 Ib 16 min. 



The results obtained from a study of Chara and Elodea were quite 

 consistent, but owing to the greater ease in making a quantitative- 

 determination, the latter plant was used for the more exact compara- 

 tive experiments. 



The action of carbon dioxide was to produce an initial sHght 

 acceleration, followed speedily by a complete cessation of movement. 

 After disconnecting the C0 2 apparatus and aspirating air through 

 the chamber the protoplasm, after the lapse of two or three minutes, 

 began to show signs of recovery. Fitful movements of the granules 

 first occurred, and then they soon resumed their processional motion 

 around the cell. At first very slow, the movement rapidly became 

 accelerated and considerably exceeded the normal rate. This accele- 

 ration was not of long dnration, and was followed by a slowing down 

 to the ordinary speed. 



