368 Dr. W. E. Adeney on the 



collected in Dublin Bay. It was filtered through glass- 

 wool and stored in glass bottles for a week before use. It 

 contained 19*45 grms. 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 in place of sea- water. 



Temperature of room 11°*5 to 11°*8 C. 

 Temperature of jacket 8°*5 to 9°'0 C. 



Distilled water at 11°'8 G. contains 14*83 c.c. N 2 per litre. 

 Depth of Laj-er 

 below surface. 1. 2. 3. 



lto 200 mm 14*60 12*27 12*20 



300 to 500 „ 11*62 11*10 11*18 



800 to 1000 „ 4*18 4*20 4-48 



1600 to 1800 „ 3*54 3*05 3*20 



Before aeration 1*55 1*73 1*97 



No. 11. — Similar to No. 10, with the exception that the air- 

 current was not filtered. 



Temperature of room 12° to 10° C. 

 Temperature of jacket 8°*7 to 8°*5 C. 

 Distilled water saturated at 10° C. contains 15*37 c.c. N 2 

 per litre. 



Depth of Layer 



"below surface. 1. 2. 3. 



lto 200 mm 13*81 12*77 12*64 



300 to 500 „ 12*20 11-17 11-08 



800 to 1000 „ 5*20 5*17 5*14 



1600 to 1800 „ 4*15 4*06 4*00 



Before aeration 1*75 1*55 1*51 



These experiments confirm the conclusion which was drawn 

 from the results of experiment No. 1, viz., that the downward 

 aeration of distilled water by the streaming effect is not so 

 rapid as the aeration of sea-water by the same means. 



They also show that the cause of the streaming was not con- 

 centrated in the first water-column, as was the case with sea- 

 water, but that, on the contrary, it equally affected the three 

 water-columns. It may be inferred from this last obser- 

 vation that the streaming being less in distilled water than in 

 sea-water, is due to the something causing it being more slowly 

 taken out of the air-current by the former than by the latter. 



