Philip Parker King,
Narrative of a Survey of the Intertropical and Western Coasts of Australia…
“ The method of curing the trepang is thus described by Captain Flinders: "They get the trepang by diving, in from three to eight fathoms water; and where it is abundant, a man will bring up eight or ten at a time. The mode of preserving it is this: the animal is split down on one side, boiled, and pressed with a weight of stones; then stretched open by slips of bamboo, dried in the sun, and afterwards in smoke, when it is fit to be put away in bags, but requires frequent exposure to the sun. A thousand trepang make a picol, of about 125 Dutch pounds ”
