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. t xix, 1896, p. 294) 

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

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



