RESISTANCE OF CILIA TO CYTOLYTIC AGENTS. 



425 



Hypotonic Sea Water. 



Hypotonic XaCl (stock solution). 



TABLE II. 



Saponin (per cent, ^represents dilution of a stock solution of 0.5 per cent, in sea 



water). 



C. 



Hypotonic Sea-water. 



Hypotonic NaCl. 



hypotonic sea water is almost exactly the same as in saponin 

 solution : there is in fact only one slight difference (Echinarachnius 

 plut.} as against two in NaCl. Evidently hypotonic sea water 

 has not quite the same action on the cilia as hypotonic NaCl, 

 but the difference is not great. No data on the haemolytic power 

 of a hypotonic balanced solution are available for comparison. 



The action of acids upon erythrocytes (Koeppe, cited by 

 Rywosch) is a function of their H + concentration, but their ac- 

 tion upon cilia of protozoa (unpublished experiments) and of the 

 giant clam (Harvey) is correlated with other factors as well. 



