502 



A.H. Estabrook 



ration. All those in the salt were dead at 60 minutes; many had 

 died earlier; the latter, of course, were not measured. The width 

 of those in the salt decreased very rapidly in the first 5 minutes, 

 then remained the same up to 60 minutes, when the animals died. 

 ^^ NaCl in hay infusion. Table IX gives the measurements 

 for growth when ^^ NaCl was added to hay infusion. 



TABLE rX 



Measurements of growth in ^^ NaCl in hay infusion. 



For the first 20 minutes in this solution, the growth in length 

 was normal. The width, however, showed a marked decrease, 

 similar to that shown in the ^^ NaCl. At the end of 30 minutes, 

 however, the Paramecia were normal in both length and width. 

 At 60 and 90 minutes those specimens in the salt were shorter 

 than the controls. After 90 minutes the Paramecia in the salt 

 showed great variations in growth. Shortly after the age of 90 

 minutes specimens began to die, although some were ahve at 30 

 hours. At the age of 40 hours none were alive in the salt, while 



