CHAPTER II. 17 



Echinids very rapidly with carbonic acid, likewise a small Teleostean 

 fish ; whilst Scyllium and Crustaceans were affected much more 

 slowly, and mussels not at all. 



27. Peroxide of Hydrogen. VOLK (Zool. Anz., xix, 1896, p. 294) 

 kills Rotatoria by means of one or two drops of a 3 per cent, solution 

 added to 1 c.c. of the water containing them. 



M. 



