% i TRAVELS TO DISCOVER
breadth to be 276 miles, equal to 92 leagues, or there- abouts.
Again, as the generality of maps have placed the coaft of Arabia where Loheia Hands, in the 44 , and it is the part of the peninfula that rims fartheft to the weftward, all the weft coaft of Arabia Felix will fall to be brought farther eaft about 3° 46' o".
Before packing up our barometer at Loheia, I filled a tube with clean mercury, perfectly purged of outward air; and, on the 30th of Auguft, upon three feveral trials, the mean of the remits of each trial was, at fix in the morning, 26° 8' 8"; two o'clock in the afternoon, 26 4' \"\ and, half part fix in the evening, 26 6' 2", fair, clear weather, with very little wind at weft.
At Mafuah, the 4th of October, I repeated the fame ex- periment with the fame mercury and tube ; the means were as follow : At fix in the morning 25 8' 1" ; two o'clock in the afternoon, 25 3' 2" ; and, at half paft fix in the evening, 25° 3' 7", clear, with a moderate wind at weft, fo that the ba- rometer fell one inch and one line at Mafuah lower than it was at Loheia, though it often rofe upon violent ftorms of wind and rain ; and, even where there was no rain, it again fell inftantly upon the ftorm ceafing, and never arrived to the height it flood laft at on the coaft of Arabia. The greateft height I ever obferved Fahrenheit's thermometer in the fhadc, at Mafuah, was on the 2 2d of October, at two in the afternoon, 93 , wind N. E. and by N. cloudy; the loweft was on the 23d, at four in the morning, 82 , wind weft. It was, to fenfe, much hotter than in any part of Arabia Felix ; but