We stood over to the largest of the south-west group, on the east side of which there stands out a conical rock, behind which it was thought that a harbour might lie, but upon examination, it proved only fit for boats; it lies in 26º 11' north. [Sidenote: Reef Island.] Reef Island lies west by north, about two leagues from Napakiang Roads; on the north side the reefs stretch a great way, but the south is more clear. Between Napakiang and the Sugar Loaf there is no place for ships to lie in safety; the bay immediately to the north was examined by Mr. Mayne, master of his Majesty's ship Alceste, when two shallow harbours were found. [Sidenote: Tides.] The flood runs to the northward and eastward, along shore, and the ebb in an opposite direction. The rise and fall is about nine feet perpendicular. High water at full and change IX. [Sidenote: Variation of the compass.] The variation of the compass, determined with great precision by the transit azimuth instrument, was 52' westerly. The longitude of the Lyra's observatory at Napakiang by the mean of thirty-six lunar observations on both sides of the moon, is 127º 37' 28" east; by four chronometers, agreeing nearly, 127º 38' 30" east. The latitude is 26º 13' 39" north. [Transcriber's Note: Crescent moons are denoted by [((] or [))]; a circle with a period therein is denoted by [(.)]] OBSERVATIONS MADE AT NAPAKIANG OBSERVATORY, GREAT LOO-CHOO ISLAND. Lunars with a Sextant. Lunars with a Sextant. [(.)] West of [((] *[Greek: a] Arietis, East of [))] 25th September, 1816. 4th October, 1816