COLOUR. 



147 



those, as far as they have been carried out in Calcutta, have been 

 seriously influenced by the climate. 1 



As regards the locality from which the material for the older 

 analyses was obtained I am certainly not wrong if I maintain that it 

 came from the Yenangyoung oilfield and not from Minbu or Yenan- 

 gyat, for reasons which are obvious. Minbu hardly produces any oib 

 and the Yenangyat production has up to a recent date been so insigni- 

 ficant that it was consumed locally. 



Colour. — By transmitted light the crude petroleum shows 

 various shades of brown, changing from dark chestnut to almost 

 black ; by reflected light the colour is a dirty dark green. 



All the examiners of Burma crude oil agree in this respect, and 

 to my knowledge there is no exception as far as the petroleum from 

 Upper Burma is concerned. Perhaps there are different shades 

 of dark brown, at different localities, but they are so imperceptible 

 that they may be overlooked. 



Specific Gravity. — In the following table I give the figures 

 regarding the specific gravity of the " Rangoon Oil " as it has been 

 ascertained by previous examiners 2 :— 





Name of examiner. 



Name of locality. 





Spec. G. 



Temp 



1830. 



Prof. Christison 



Yenangyoung oilfield 





o-88o 



6o'F. 





H. Vohl 



n 







885- 



-0-890 





1865. 



Messrs. Warren and Hofer „ 







0-875 



84°F. 



1891- 



Mr. Holland 



Kodoung 



No. 1 





0-875° 



85 C F 





11 



ii 



No. 16 





0-887 



1, 





11 



•1 



No. 13 





0-879 



3' 





ll 



Twingon 



No. 310 





0-863 







II 



i» 



No. 306 



No. 374 





0-865 

 0-872 







)l 



Berne 



No. 504 





0-887 







II 



ji 



No. 516 





0-892 





1 Records of the Geological Survey of India, vol. XXIV, page 251. 



2 B. Redwood, Cantor Lectures On Petroleum and its Products, 1886, page l6, states 

 that the sp. gr. of oil from Minbyin (Burma) is o - 866. No such place is known to me, 

 but it is very probable that the name of the locality is misspelt. 



L 2 ( 193 ) 



