496 



A.H. Estabrook 



A ^ NaCl solution in'pure distilled water also gave interesting 

 results, as shown in Table IV. 



TABLE IV 



Comparative measurements in microns of Paramecia in J^- NaCl dissolved in pure distilled water, and in 



hay infusion 



At the end of 10 minutes, the Paramecia in the ^ NaCl solu- 

 tion were shorter than the controls. Grow^th was still retarded 

 at 90 minutes and at 5 hours. At the end of 24 hours the speci- 

 mens in the salt were long hut not so thick as the controls. 

 The controls, however, had increased from 10 to 13 specimens, so 

 that those in the salt were only slightly retarded in growth. 

 Those in the salt showed evidences of injurv'. 



T.\BLE v 



Comparative measurements in microns of Paramecia in ^ NaCl dissolved in pure distilled water, and in 



hay infusion 



