AT SEERY PAO POI NGS sit Gees), osawivol « sPErel bawy tol io héve* ; 
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The map which accompanies this repent is constructed upon “ge modified projection, 
on a scale of 1 a ,000, and based upon the 
paigns of 1842 and 1943-'44. The longitudes es are referred to the meridian of Greenwich, hd de- 
pend upon eighteen es gee stations ; ; four of which are determined b by oc occultations of fixed 
stars; and ‘the’ - €clipses of ‘the satellites of Jupiter: _All the longitudes on 
ae 
the map wile bet chon trically | rted to, these positions. 
* In the Coute of the last fin $0 it ‘became evident that the longitudes establ during 
the campaign @f 1842 were collectively thrown’ thrown’ too far to the westward, b tgs 3 
Arietis, to which tt hey had been referred by the. chro; mometer. This oswitstion took place af the 
bright Timb"c of the ‘noon, which e experience has recently own to be i of little com- 
ce nee. | This position has therefore ‘been abandoned, and the longitudes depending 
upon it have been referred chronometrically to those establishéd in 1843 and. 1814. The course 
of the ensuing “expedition en tersect the line ‘established by our jprevious operations, at various 
points, which it is proposed to. correct in longitude by lunar culminations, and such: other‘absolute 
_ observations as may be canvehteciy obtained. Such a position at the mouth of the Fontaine-qui- 3 
uit, on the Arkitigas tivér, will be-a good point of reference for the longitudes ‘along the foot of 
the mountains. In: ‘passing by the Utah, to thé southern portion of the Great Salt lake, we shall 
have an oppi to: verify our longitudes in that quarter; and as in the c urse of our exploration. : ie 
we shall tou upon several points previously determined along ‘the west limit of our recent “ 
journey, ai shall probably ‘be able to form a reasonably correct frame on: which to base the con- 
straction of ai general: map of the- country. In that now presented, we have carefully avoided to Jay” 
own as certain which may not be found in the pas hooks. of ps sorvents hich were ; 
sta try in: which we wei ‘ 
ilkes Iam indebted for the long Fort Vancouver and 
to me before the publication of his mop Our recon- 
cordin to the survey of Vancouyet pnd the bay of 
San Pao mt fhe aye Possession 
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