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 oil, 

 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 9 F. 





H. Vohl 



11 



O' 



885—0*890 





1865. 



Messrs. Warren and Hofer „ 





0-875 



84°F. 



1891* 



Mr. Holland 



Kodoung 



No. 1 



0-875° 



85°F 





n 



ji 



No. 16 



0-887 



11 





n 



»» 



No. 13 



0-879 



i» 





» 



Twingon 



No. 310 



0-863 



it 





n 



ii 



No. 306 



0-865 



11 





11 



>i 



No. 374 



0-872 



»> 





11 



Berne 



No. 504 



0-887 



M 





11 



ii 



No. 516 



0-892 



11 



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



3 B. Redwood, Cantor Lectures on Petroleum and its Products, 1886, page 16, 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 ( I93 ) 



