Smithsonian Report, 1899.— Burdon-Sanderson. 



Plate I. 



Photograph 1. 



Photograph 2. 



Photograph 3. 



1, 2, 3. Curariscd Sartorius kept for about twenty-four hours in 0.6 per cent solution 

 of chloride of sodium. Temperature during observation 9° C. Contacts, 

 etc., as in diagram 5, but j) much nearer to a. 



