At Oneeheow, they brought us several large roots of a brown colour, shaped like a yam, and from six to ten pounds in weight. The juice, which it yields in great abundance, is very sweet, and of a pleasant taste, and was found to be an excellent substitute for sugar. The natives are very fond of it, and use it as an article of their common diet; and our people also found it very palatable and wholesome. We could not learn to what species of plant it belonged, having never been able to procure the leaves; but it was supposed by our botanists to be the root of some kind of fern. Agreeably to the practice of Captain Cook, I shall subjoin an abstract of the astronomical observations which were made at the observatory in Karakakooa Bay, for determining its latitude and longitude, and for finding the rate and error of the time-keeper. To these are subjoined the mean variation of the compass, the dip of the magnetic needle, and a table of the latitude and longitude of the Sandwich Islands. The latitude of the observatory, deduced from meridian zenith distances of the sun, eleven stars to the south, and four stars to the north of the zenith 19° 28ʹ 0ʺ north. The longitude of the observatory, deduced from 253 sets of lunar observations; each set consisting of six observed distances of the sun from the moon, or stars; fourteen of the above sets were only taken at the observatory, 105 sets being taken whilst cruizing off Owhyhee; and 134 sets, when at Atooi and Oneeheow; all these being reduced to the observatory, by means of the time-keeper 204° 0ʹ 0ʺ east. The longitude of the observatory, by the time-keeper, on the 19th January, 1779, according to its rate, as found at Greenwich 214° 7ʹ 15ʺ east. The longitude of the observatory, by the time-keeper, on the 19th January, 1779, according to its rate, corrected at different places, and last at Samganoodha Harbour, in Oonalaschka 203° 37ʹ 22ʺ east. The daily rate of the time-keeper losing on mean time, was 9ʺ, 6; and on the 2d February, 1779, it was 14^h 41ʹ 1ʺ slow for mean time. The variation of the compass, by azimuths observed on shore, with four different compasses 8° 6ʹ 0ʺ east. The variation of the compass, by azimuths, observed on board the Resolution, with four different compasses 7° 32ʹ 0ʺ east. Dip of the north } Balanced needle 40° 22ʹ 30ʺ pole of the magnetic } Unbalanced } needle on } or plain } 40° 41ʹ 15ʺ shore, with } needle } Dip of the north } pole of the magnetic } Balanced needle 41° 50ʹ 0ʺ needle on } Unbalanced } board, with } needle } 40° 30ʹ 45ʺ _A Table of the Latitude and Longitude of the Sandwich Islands._