Thus, 



and 



_ 2.3 x 1Q" 4 < 2 x 10 s _ 76£ 



'us " 2.3 x 10 3 4. 79 x 10 -2 ' 119 



= 1 x 10~ 6 • 4. 17 x 10 3 • 6.39 



= 2.67 x 1(T 2 = 0.027 



iT S53 = 1 x 10 _b • 4. 17 x 10 J • 3.0 



= 1. 25 x 10~ 2 = 0.013 



These figures are uncorrected for standard conditions since 

 barometric pressure at time of experiment aboard ship was 

 not taken. However, a barometric fluctuation amounting to 

 even as much as 20 mm would have no more effect on the 

 final value of K than: 



^353 ±0 - 004 ' 



Experiments were conducted at constant temperature, 

 7. 0°C. It is assumed that diffusion across pneumatophore 

 walls can be in either direction and will move according to 

 the partial pressure gradient. * 



*Larimer and Ashby 5 have reported the results of their efforts to determine the diffusion rate 

 of carbon monoxide across the pneumatophore walls of the Portuguese man-of-war, Physalia. 

 Their absolute rates, unfortunately, are not presented in a manner permitting direct compari- 

 son with the values given here for Nanomia. However, the diffusion rate which they found 

 for CO relative to that of oxygen was 17 to 25 percent lower than the latter, agreeing with 

 the observations of Krogh 19 for chitin. 



50 



