After having fished along the coast to the eastward until the westerly monsoon breaks up, they return, and by the last day of May each detached fleet leaves the coast without waiting to collect into one body. On their return they steer North-West, which brings them to some part of Timor, from whence they easily retrace their steps to Macassar, where the Chinese traders meet them and purchase their cargoes. At this time (1818) the value of the trepang was from forty to fifty dollars a picol;* so that if each vessel returns with 100 picols of trepang, her cargo will be worth 5000 dollars. Besides trepang, they trade in sharks' fins and birds' nests, the latter being worth about 3000 dollars the picol. (*Footnote. The value of the trepang in 1822 was much less; the price had fallen to twenty-five dollars the picol.) Dramah informed me that there are several rivers upon the coast, but that in procuring water from them they are generally attacked by the Maregas, whom they describe as treacherous and hostile, and by whom they are frequently defeated; for the Indians attack them only when they are unprepared. Their small canoes are frequently stolen from them, which accounts for the one we captured from the natives of Goulburn Island. A perpetual warfare exists between them, so that it would be a difficult matter for us to procure a friendly communication with a people who cannot, of course, discriminate between us and the Malays. I regretted to hear this, for our force was so small that I feared we should, in our future visits to the coast, be frequently attacked, and perhaps be under the necessity of convincing them of the destructive power of our weapons, which they must first experience before they can dread their fatal effects. During our stay at Coepang the thermometer ranged between 75 and 91 degrees. The latitude of the flag-staff was observed by several observations to be 10 degrees 9 minutes 40 seconds. No observations were taken for the longitude, on account of my being confined to my bed with an attack of ague, the effects of which remained upon me for some time afterwards; but the result of those made by Captain Flinders and Commodore Baudin were so satisfactory that I had no hesitation in taking the mean of the two, 123 degrees 35 minutes 46 seconds, for the correction of my chronometers, and for the purpose of comparing with the longitudes I had assigned to several parts of the coast that we had just left.