1914] on The Coming of Age of the Vacuum Flask 



2G1 



Proportion of Uncoxdeksable Gas at 20"^ Absolute. Air-Nitrogen 



OBTAINED IN DIFFERENT WaYS. (TablE II.) 



Reagent for removing Oxygen 



Gas Pressure Parts per 



left of 760 mm. i Million 

 (Fnlt 10^* mm.) Volumes 



(Theoretical value) .... 



Hot copper and copper oxide . 



Yellow phosphorus (combustion) 



Red phosphorus (combustion) . 



Red phosphorus (combustion), H removed 



Ferrous oxide and water 



Ferrous oxide and water, H removed 



Phosphorus (yellow) and water 



Phosphorus (yellow) and water, H removed 



Copper and ammonia solution 



Copper and ammonia solution, H removed 



Sodium hydrosulphite 



Cuprous chloride, acid solution 



Pyrogallate (alkaline) 



Pyrogallate (alkaline), H removed . 



Chromous chloride, acid solution 



Chromous chloride, acid solution, H removed 



226 

 228 

 220 

 392 

 212 

 1260 

 203 

 524—1410 

 212 

 707 

 210 

 219 

 226 

 284 

 211 



29-7 

 30-0 

 28-9 

 51-6 

 27-9 

 166-0 

 26-7 

 68-9—186 

 27-9 

 93-0 

 27-6 

 28-8 

 29-7 

 37-4 

 27-9 



520- 



-200,000 68-4—26,300 

 236 31-1 



By pursuing the same methods it has been found that hydrogen 

 was steadily given off in the king gases. The lecturer's production 

 was about 100 c.c. a day ; but that of one of the assistants gave 

 about a quarter of a litre. Experiments have also been made on 

 animals, from which it appears that hydrogen is being given off in 

 respiration by warm-blooded animals. Hydrogen must be therefore 

 escaping from the earth or is being oxidised in the upper air ; unless 

 we assume the proportion of hydrogen in the air is increasing in the 

 lower state. Probably both processes are in progress. A summary of 

 the results obtained by the analysis of lung gases is given below : — 



Proportion op Uncondensable Gases at 20'^ Absolute in 

 Respired Air. (Table III.) 



