292 CHEMICAL DISCOVERY AND INVENTION 



(Day quoted by Redwood.) 



COMPOSITION AND USES OF PETROLEUM 



Before attempting to enumerate the various uses to which 

 petroleum and products from it are applied, it will be well to 

 take a survey of the general nature of these products. The 

 compounds which have been identified among the products 

 of distillation are very numerous, and in the following table it 

 has been thought sufficient to include only those which are the 

 most abundant and characteristic. They are ranged according 

 to their physical condition at the common temperature of the 

 air, and according to their chemical composition. 



PENNSYLVANIAN PETROLEUM 



GASEOUS 

 Paraffins. Olefines. 



Marsh-gas CH 4 Ethylene C 2 H 4 



Ethane C 2 H 6 Propylene C 3 H 6 



Propane C 3 H 8 Butylene C 4 H 8 



Butane C 4 H 10 



