CHEMICAL COMPOSITION. 157 



pipe lines cool to such a degree, that if oil remains therein during 

 the night, it congeals and so effectually clogs the pipe that hours 

 may lapse before it runs again. 



Lately Professor Engler has determined the melting point of 

 several samples of petroleum from Upper Burma. According to 



him, — 



i Yenangyat well No. 15 melts at ... . 78-8°F. 



2 „ (mixed sample) ,, „ • • • 8i*5°F. 



3 Kodoung well No. 26 ,, „ • . . • 87*8 C F. 



4 Twingon „ No. 62 „ „ . • . • 87'8°F. 



It would be rash to form a conclusion from these few data, but 

 we may safely say that at a temperature below 75°F. the Burma 

 petroleum becomes solid and forms a greasy matter like lard. The 

 above figures seem also to indicate that the higher the specific gravity 

 the higher is the melting point ; however, with regard to this further 

 observations are required. 



Chemical composition. — As already stated there still remains 

 much to be done in this direction, because no detailed analysis has 

 been made as yet. We shall therefore have chiefly to deal with 

 the chemical composition from a commercial point of view. 



The only elementary analysis of Burma petroleum which I could 

 find has been made by H. Sainte Claire Deville. 1 According to this 

 author " Huile de Birmanie (Rangoon)''' of a specific gravity of 



•875 at 82*4° F. consists of — 



C • 83-8 



H 127 



O . . . . . . . . 35 



100. 

 According to Messrs. De la Rue and M filler 2 the following members 

 of the Benzol series have been found in the crude petroleum of 

 Burma- 

 Benzol ..... # C l2 H 6 

 Toluol C l4 H 8 



x yioi c l6 h i0 



Cumo! C l8 H12 



1. Comptes rendus, 1869, page 500. 



2. Proceedings of the Royal Society of London, vol. VIII, page 225. 



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