



1917] 



DENN Y—PERMEA BILI T Y 



3«i 



coefficients for io° C. as recorded in table V. These data were not 

 corrected for change in osmotic pressure due to change in tem- 

 perature, because, as will be shown later, the rate is not exactly 

 proportional to the pull applied. But that this correction would 





TABLE V 



Value of Q 10 





3.6-i 3 ?6C. 



I3.6-23?6C. 



23.&-33?6C. 



I. 716 

 1 .610 

 I.667 

 1 .607 

 1 .607 



1. 541 

 1.424 



1.492 



1.400 



1.500 



I-J05 



I 403 



1-342 



1. 357 



1-336 



Average, 1.641 



1.463 



1348 



be a small one and that it would not affect the general results, is 

 indicated by the following results obtained when a correction is 

 figured on the assumption that the rate is proportional to the pull . 

 Making this correction, the first column of table IV, showing values 

 °f Qio, becomes: 





1.649 



1 547 

 1 .604 



* 



1-545 

 1 -546 



In addition to 



Average, 1 . 578 



preliminary 



measurements of 6 other membranes. While the conditions of the 

 experiment were not so accurately controlled, the 

 coefficients obtained were as follows : 



average 



Approximately 5 to 15 Q 



10 



u 



Temp 



sffi> 



=1.617 



15 to 25 Q I0 =i.47o 

 25 to 35 Q IO =i422 



The effect of temperature upon a 



1 much used to obtain informat 

 chemical or oh vsical . Generally 



►peaking 



(Qio =2 to 3), but the effect of 





