Transmission of Gases through Water, 3G7 



The air-current was a slow one, at the rate of about 

 1 litre per hour. The aeration was continued for 48 hours 

 and then stopped. Samples of water were then drawn 

 from each tube as before, and stored in glass vessels 

 standing over mercury. The nitrogen determinations are 

 given below. The tube in which the air-current first 

 entered was marked 1, and the one it next entered 2, and 

 so on. The air was filtered through glass-wool. 



Temperature of room 12°*8 to 10°*0 C. 

 Temperature of jacket S°'6 to 8°*3 C. 



S ;i-water at 10° C. contains 12*47 c.c. N 2 per litre. 



Depth of Layer. 1. 2. 3. 



1 to 200 mm 12'24 11*15 11*09 



800 to 1000 ., 8*20 2*29 2*55 



1600 to 1800 „ 8*13 2*18 2*54 



Before aeration 1*57 2*13 2*51 



No. 9. — Similar to the experiment No. 8, with the exception 

 that the air-inlet tubes dipped only 50 mm. below the 

 surface. The air-current was filtered through glass-wool. 



Temperature of room 13°* 7 to 13°* 5 C. 

 Temperature of jacket 8°*4 to 8°*5 G. 



Sea-water at 13 0, 5 C. contains 11*67 c.c. N 2 per litre. 



Depth of Layer. 1. 2. 3. 



lto 200 mm 10*81 7*15 6*93 



300 to 500 „ 10*60 1*61 1-52 



800 to 1000 „ 9*36 1*65 1*56 



1600 to 1800 „ 9*20 1*65 1*52 



Before aeration 1*75 1*63 1*51 



These results show that, when the current of air is suffi- 

 ciently washed during its passage through the surface-layer 

 of the first column of sea-water, it may be passed through the 

 surface-layers of other columns of sea-water and no streaming- 

 effect occurs; although the layer of water through which the 

 air is bubbled . soon becomes saturated with atmospheric 

 nitrogen. 



It may therefore be concluded that the streaming effect is 

 not due to concentrated solution currents, as suggested by 

 Hiifner, but by something in the air besides its chief gaseous 

 constituents; and that, when the something is washed out, the 

 subsequent solution of the gases is not attended by streaming. 



The sea-water employed for these experiments was also 



