Aprenry— Unrecognised Factors in the Transmission of Gases through Water. 167 
These results show that, when the current of air is sufficiently 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 concen- 
trated solution currents, as suggested by Hiifner, but to something in the air 
besides its chief gaseous constituents, and that when that something is washed 
out, the subsequent solution of the gases is not attended by streaming. 
The sea-water employed for these experiments was also collected in Dublin 
Bay. It was filtered through glass wool, and stored in glass bottles for a week 
before use, It contained 19°45 grams chlorine per litre. 
Similar experiments were made with distilled water, as there were reasons for 
anticipating that the cause of the streaming would not be so rapidly washed out 
by distilled water as by sea-water. 
Experiments with Distilled Water. 
No. 10.—Similar to experiment No. 8, with the exception that distilled water was 
used mstead of sea-water. 
Temperature of room, > Wiles ti TLIC 
Temperature of jacket, . 8°5° to 9-0°C. 
Distilled water at 11:8° C. contains 14°83 cc. N, per litre. 
Depth of layer below surface. 1 2 3 
1to 200mm., so EBD gg MOR | TDD 
300 to 500mm., so Wg STD ig THT 
800 to 1000 mm., Oe gd. Save NK) 45 Ge4e 
1600 to 1800 mm., fn 3°54 Se 3°05 310 3°20 
Before aération, bs 1:55 v4 1:73 5K 1:97 
No. 11.—Similar to No. 10, with the exception that the air-current was not filtered. 
Temperature of room, : 6 IA ym IO 
Temperature of jacket, . 5 BPA ti Sw Ce 
Distilled water saturated at 10° C. contains 15°37 ce. N, per litre. 
Depth of layer below surface. ei 2 3 
1to 200mm., ee 3,9) ee 2) 2 
300 to 500mm., 50 | IDPH ~~ 55) Misty gg NOB 
800 to 1000 mm., 20m NLL ANS riitt 5:14 
1600 to 1800 mm., ers | omer ar OG unt 4:00 
Before aération, < 1:75 a 155 ae 1°51 
These experiments confirm the conclusion which was drawn from the results 
of experiment No. 1, viz., that the downward aération of distilled water by the 
streaming is not so rapid as the aération of sea-water by the same means. 
They also show that the cause of the streaming was not concentrated in the 
