in g has been to the northward o f the observations; and that, b y about ten degrees on the whole traverse, when 1 7 degrees o f variation have been allowed. I t will hardly be supposed that the difference arises from allow in g to o much variation b y ten degrees; but it is singular, that the e r ro r should, in all cases but one, lie the same way. I do not b y any means regard the error as considerable, circumstances co n s id e r e d :* nor is it o f any consequence in the parts where the observations o f latitude serve to co r re ct it : as between Pisania and Jarra. M r . P a rk was plundered o f his sextant at Jarra, which accident o f course p u t an end to his observations o f latitude; and thus, unfortunately, left the remaining h a l f (very nearly) o f his geography in a state o f uncertainty, as to parallel. T h is point, therefore, must be regarded as the most advanced geographical station, that rests on any certain basis o f parallel. H ow e v e r , the remaining part o f the route will not appear to be much out, when it is’ seen how nearly the bearing o f Sego , as determined b y M r . P a rk , agreed with the line o f direction pointed out from Jarra. I t is} no doubt, a favourab le circumstance, that the instrument was not iost at an e ar lier period, and before the commencement o f the intricate route between the pass o f the Senegal r iv e r and J a r r a ; to which may be added, the advantage o f a known p a ra lle l, from whence to set o f f the v e ry important bearing o f T om b u c to o . In effect, the bearing was pointed out from Benowm, but this place being nearly east from Ja r ra, and the bearing in question E - N , no error o f any magnitude can be looked for. Ja rra (called also Ya r ra ), has already appeared in the maps drawn for the A s so c ia tion , and was o rigin a lly taken from M . Delisle’s M a p ; but was neglected, o r o v e r lo o k ed , b y M . D ’A n v ille . In the former m ap it was placed somewhat more to the west, and in a higher parallel by about £ o f a degree. Between Jarra and W a s s ib o o , Mr. P a rk ’ s reckoning, as it appears wrought up in his table o f d a y ’ s works, gives 41 min. diff. o f latitude N , and * Mr. Carmichael came within 6 or 7 degrees in the bearing between Aleppo and Bussorah, on a distance o f 720 British miles. But the advantages were prodigiously in bis favour; the road being straight, the country open, and the camel walking an equable pace. (See Phil. Trans, for 1791.) ,i° 3 1 ' diff. longitude E ; which reduced to departure, in miles, is 89, and produces a course o f E 26° S . B u t he allowed no variation after he le ft J a r r a : and as I allow 1 7 0, the course must be taken, at E 9? S , distance g6~ geographic miles, F rom this arises a diff. lat, o f x6; o n ly ; departure. 9 5 ; and, hence, Wass ib oo should be. in latitude ar*d 9 5 east o f Ja rra.* M r . P a rk was so lu ck y as to preserve his original bearings,t between Diff; Lat. S. ’.’.Diff. Lon. E / N. E. * J a r ra to Doolinkeaboo 7 24 Queira - - f - I l # 25' Diggani § - x9 8 Sherilla • - • 14 40 Seracorro - - Dama . - II 4 , S e g o 6 W aw ra - 5 . f 8 Dingyee - - 281 E Wassiboo | - _ 7 Sari?anding - 10N ; l<?E Satile - - - 18 . 31 Sibiti. - - - — 7 Galloo - ' ' - ,C) ' ’ L ™ r ’ '2 1 ' Nyara-: - O g ' 3 16 Mfooija - - . i >• ' 4 N % i 4 ‘ Modiboo .. ' ' * : 3 19 Datiliboo - - - 9 S 38 Silla 2 12 Fanimboo. - - 12 . 24 La t. by account 13° 22; \ Jiosorra - _ ‘ . .7 | 18 Diff. Ion. r® i j E - j 18 N 69 E N o variation was allowed in this calculation'. 1 t Original bearings between Wassiboo Jj and Diggani. § Wassiboo to . Satile Galloo - : Moorja Datiliboo Fanimboo Jiosorra - . Doolinkeaboo - Lions - t Diggani J On working these bearings over again, it appeared that Mr. Park had made a mistake ; and thence inferred a wrong position for Diggani, -Sego, &c. in his table o f latitudes and longitudes. I mention this, to shew that he has acted fairly) in exposing his whole process; and even his errors. e Dist. Bearings. qo S E b E 20 ESE E b N 25 S E b E ESE - 20 ESE - S E b E - 18 S E b S - 7 South
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