398 Prof. Adeney and Mr. Becker : Determination of Kate of 

 (b) Experiments ivith Oxygen. 



The oxygen was prepared by heating potassium per- 

 manganate in a hard glass tube, and washing the gas with 

 caustic potash to remove any traces of carbon dioxide which 

 might be formed. The apparatus was exhausted several 

 times with a water-pump to wash out the last traces of air. 

 The gas was collected over water which had been boiled for 

 some time and cooled out of: contact with air. 



A series of experiments was made over a range of 

 temperature of 35°, and the results treated Jjv the two 

 methods as mentioned in the case of nitrogen. The results 

 are contained in Table VIII., and the variation of h with 

 temperature is shown in fig. 7. 



Table VIII. 

 Results of Experiments with Oxygen. 



Tempera- 

 ture, 



°C. 



25 



Values from , 

 log graph. 



Values from W 

 graph. 



Saturation Values. 



Mean 



Value of 



b. 



•264 



t. b. 

 77 -252 



a. 

 1-235 



w, 



4-47 



b. 

 •276 



A dene j 



and 

 Becker. 



4-450 



Winkler. 

 4-600 



Bohr. 

 4690 



8-8 



64 -310 



1-230 



3-910 



•315 



3-814 



3-970 



4-080 



•313 



15-5 



59 -336 



1-140 



3330 



•342 



3-254 



3-372 



3-450 



•339 



202 



54-5 -356 



1-150 



2950 



•390 



2-970 



3-040 



3-110 



•373 



25-2 



51 -392 



1-150 



2-810 



•410 



2-812 



2-810 



2-880 



•411 



303 



46 -437 



1-080 



2-450 



•432 



2-485 



2-510 



2-575 



•434 



351 



43 -477 



1-120 



2-250 



•498 



2-323 



2355 



2-400 



•487 



In the above series of experiments the water in the tube 

 at the end of each experiment was analysed for dissolved 

 gases, using the extraction pump and measuring apparatus 

 described in Part I. of this communication. The solubilities 

 of oxygen and nitrogen at the given temperatures as cal- 

 culated from these analyses are given in Table IX., as are 

 also the values obtained by Bohr and Winkler by absorptio- 

 metry methods. 



