GODING — PETROLEUM. 
43 
Gnces consist I am not prepared to say ; but as it will servo 
fo invest with greater interest any forthcoming inquiry of 
their several adaptations for economic purposes, I hero 
subjoin what little is as yet known of the Barbados minoral 
products. » 
The Green Tar is not a true Petroleum, having as the 
Oil refiners say, “ no spirit” ; but is a liquid substance 
of somewhat thicker consistence than ordinary treacle, of a 
greenish-black colour and ponetrating odour. It contains 
certain liquid and solid hydro-carbons, the chief of which 
appears to be napthaline, paraffine, benzine and asphal- 
turn. Its specific gravity is 0.950. When subjected to 
distillation a crude oil results, having a spocific gravity of 
0.910. The distillation yields — 
Water , . .06 
Coke 06 
Crude Oil., .88 
100 
It may be stated that 100 barrels of green tar give on an 
average 80 per cent: of the crude oil. The Tar itself is a 
good lubricator, but when distilled, tho resulting oil, of a 
transparent and rich brown colour, has that property in 
greater perfection, and is found by parties in England and 
in the United States to be equal to, or even to excel as a 
lubricator, all othor British and American oils, tho sperm 
oil not excepted. When further subjected to a refining 
process by chemical treatment, and tho elimination of its 
paraffine, tho oil so treatod yiolds a product of an ambor or 
straw-color without smoll or loss of its lubricating property. 
As regards tho illuminating power of tho oils from the tar, 
this is said to be less than that of othor oils. In this res- 
. pect then, the oils from tho tar do not rank very high, in 
