Adeney and Beckeu — Solution of Nitrogen and Oxygen. 151 



For this experiment a double-bulbed tube of the form shown in fig. 3 was 

 employed. The two bulbs A and B were of 175 cc. capacity each. They 

 were connected by a narrow tube C, 6'4 mm. bore and 300 mm. long. The 

 lower bulb B terminated in a small draw-off tube h, and the 

 upper bulb A was continued by the straight tube D, abont 

 50 mm. long and 20 mm. bore. 



The whole tube was exhausted and filled with sea-water, 

 the dissolved gases in which had been previously removed 

 by boiling the water in vacno, and extracting the gases by 

 means of the mercury pump, described in Part I of this 

 communication. The tube after being filled was securely 

 closed from contact with the air, and placed in a thermostat, 

 kept at the temperature of 12-7° to 13° C. 



When the contents of the tube had attained the tem- 

 perature of the thermostat, the cork was removed, and a 

 little water was drawn out so as to lower the level of the 

 water in the tube to about 20 mm. below the mouth of D. 

 The tube was. then fitted with a cork, furnished with outlet- 

 and inlet tubes, so that a small air space was left above the 

 water in D, through which a current of air could be drawn 

 without disturbing the surface of the water. Two weighed 

 calcium chloride tubes were attached to the outlet tube, to 

 absorb the water-vapour brought over from tlie water in 

 the bulb with the air-current, and to afford the means of 

 determining the weight of water evaporated during the 

 experiment. 



A current of air, previoiisly dried by passing through 

 calcium chloride tubes, was drawn through the air-space in 

 the tube for six days. The dissolved air-content of the 

 water in the upper and lower bulbs was then separately 

 determined, with the following results : — 



Gases expressed in cc. at N.T.P. per 1,000 cc. sea- water. 



c. 



Fig. 3. 



Oxygen, 

 Nitrogen, 



The initial air-coulent of the water in the two bulbs may be taken as 

 practically 0. 



Sea-water when saturated with air at 13°C. contains per litre : — 



Oxygen, 6'06 cc. 



Nitrogen, 1177 cc. 



SOIENT. PKOO. K.D.S., VOL. XVI., NO. XIII. X 



