SYNTHETICAL EESEAECHES ON ACIDS OF THE LACTIC SERIES. 311 



No. I. shows the amount of hydrocarbon of the form C„H2«; No. II. gives the results 

 of the combustion of the gas remaining after the action of anhydrous sulphuric acid ; 

 whilst No. III. is a combustion of the gas previous to the action of sulphuric anhydride. 



No. I. proves that the original gas consisted by volume of 



Gas absorbable by S O3 . . . 116'1 or 48" 95 per cent. 

 Gas unabsorbable by S O3 . . 121 '1 or 51"05 per cent. 



Analysis No. II. gave the following results : — 



Volume of combustible gas .. 29-1 or 1 

 Volume of oxygen consumed . . 99'9 or 3"43 

 Volume of C O2 generated . . 57-4 or 1 "97 



These numbers show that the gas left unabsorbed by sulphuric anhydride is ethylic 

 hydride, one volume of which consumes on combustion 3-5 volumes of oxygen and 

 generates 2 volumes of carbonic anhydride. 



Analysis No. III., taken in connexion with No. II., determines the composition of 

 the gas absorbed by sulphuric anhydride, and proves it to have the composition of 

 ethylene ; for 27*8 volumes of the mixed gases consumed 89-9 volumes of oxygen, and 

 generated 55-5 volumes of carbonic anhydride; or 



Vol. of comb. gas. consumed. C 0^ generated. 



1 : 3-23 2-00 



whereas 1 volume of a mixture of equal volumes of ethylic hydride and ethylene would 

 consume 3-25 volumes of oxygen, and generate 2 volumes of carbonic anhydride. Hence 

 the original gas consisted of 



Ethylene 48-95 



Ethylic hydride 51-05 



100-00 



This result is confirmed by a determination of the specific gravity of the gaseous 

 mixture, which gave the following results : — 



Temperature of room 13°-3 C. 



Height of internal above external mercury 0-1 millims. 



Weight of fiask and gas 29-947 grms. 



Temperature in balance-case 18°-3 C. 



Weight of flask and air 29*9405 grms. 



Temperature in balance-case 18°-3 C. 



Height of barometer . 746-0 millims. 



Capacity of flask . . 141-6 cub. centims. 



Specific gravity of gas 1-0375. 



The specific gravity of a mixture of ethylic hydride and ethylene in the above pro- 

 portions would be 1-0026. 



2u2 



