476 PROCEEDINGS OF THE SOCIETY. 



Mr. Hardy said that the syrup being added very gradually, diffused 

 itself through, the water, so that the density of the liquid very soon got 

 to be the same within the creature as outside, which he thought would 

 prevent the distortion mentioned. He did not remember to have tried 

 the plan with Asplanchna, but he had done so with Bursaria, which was 

 a very active animal. 



The President said he should certainly try the method. There was 

 another substance sometimes used for the purpose, and that was a very 

 weak solution of salicylic acid. The rotifers would swim about in this 

 for hours, and then slowly die. This was the only way in which he had 

 found it possible to see Synchseta. Another thing sometimes used was 

 a very weak solution of chromic acid. A weak mixture of the two acids 

 was also a good preservative. 



Mr. Hardy asked whether the acid did not kill the rotifers. 



The President said that the solution used did so after six hours or so, 

 but it also preserved them. 



Mr. Hardy said that the syrup had the great advantage of simply 

 quieting without killing them, and their freedom of action could be 

 afterwards restored by the addition of more water. 



The following Instruments, Objects, &c., were exhibited:— 



Dr. Hudson : — Wax model of the trophi of Asplanchna. 



Mr. T. F. Smith : — Abbe Diffraction-plate and Photomicrographs. 



New Fellows : — The following were elected Ordinary Fellows :— 

 Messrs. Joseph E. Katcliffe, M.B. ; Thomas W. Shore, M.D., B.Sc. 

 Clarence M. Weed, M.Sc. ; and Eev. B. Jones Bateman. 



