Various, Chambers's Journal of Popular Literature…
“ The oil obtained from the seals is as valuable as that got from the arctic whales, whilst their skins are also of some commercial importance. It was a happy circumstance that just as whale-fishing began to fall off, gas as an illuminant became common; and although train and sperm oils are still used in various manufactories, and especially in jute-mills, the mineral oils which have been found in such quantity have doubtless served many of the purposes for which whale-oil was at one time in constant demand. ”
