arness and accuracy.

The astronomical observations were begun at the Grand Falls early in
June, 1843, and were carried up the St. John River to the Northwest
Branch by a chain of stations, which, together with the results
obtained, are tabulated in the appendix accompanying this report.

From the valley of the St. John an astronomical connection was made with
Quebec, and thence to Montreal, and so to Rouses Point. From Rouses
Point a connection was obtained with Cambridge University, near Boston.

The astronomical stations on the west line were: Intersection of Halls
Stream by the west line, Lake Memphremagog, Richford, Rouses Point, John
McCoy's, Trout River, St. Regis.

Latitude was also obtained at an astronomical station established for
the purpose at the head of the Connecticut.

Volumes containing the astronomical observations of both commissions are
herewith submitted. From them it will be observed that the results for
absolute longitude obtained by the British and American astronomers do
not agree. It being a difference in no way affecting the survey of the
boundary line, the undersigned do not feel called upon to attempt to
reconcile it. The data upon which those results are based may be seen
in the volumes of observations accompanying this report.

In the appendix will be found, in a tabular form, the following:

An abstract of the survey of the boundary along the north line; an
abstract of the survey of the boundary along the southwest line; an
abstract of the survey of the boundary along the south line; an abstract
of the survey of the boundary along the highlands; an abstract of
the survey of the boundary along the west line; the position of the
monuments erected on the Southwest Branch of the St. John and on Halls
Stream; the distribution of the islands of the St. John and the
monuments on them; the guide lines and offsets run by each commission
for the survey of the highlands; the azimuths of verification for the
survey of the highlands; the latitudes and longitudes obtained from the
astronomical observations; the comparative longitudes obtained, and the
methods used for the purpose.

Upon comparing the maps of the two commissions it will be seen that the
American commission numbers two monuments more than the British. Those
are to be found, one on the "Fourth Island," in the river St. John, and
the other on the highlands between the source of the Southwest Branch of
the river St. John and the Ke