portage represented on the map 5-1/6 miles long.

The Alleguash was ascended in the month of October in bateaux and canoes
from its mouth to its source in Lake Telos, a distance of about 94
miles. The river and its lakes were coursed by a compass, the distances
estimated, and the projection resulting therefrom corrected before being
placed upon the map by means of astronomical observations at eight
intermediate points between its mouth and its source. The lakes were
triangulated by means of magnetic bearings as far as was practicable,
in order to obtain their widths and general contour. In the vicinity
of Chamberlain Lake use has also been made of a recent survey of Mr.
Parrott, a surveyor in the employ of the State of Maine, to whom we
acknowledge ourselves indebted for the aid which this portion of his
valuable labors furnished us.

Between the head of Lake Telos and Webster Pond, one of the sources
of the East Branch of the Penobscot, there is a portage of only 1 mile
and a half. This, together with a small cut or canal, made in 1841 to
connect the waters of Lake Telos with those of Webster Pond, enabled the
party which made this survey to proceed with their boats and baggage
down the Penobscot to Bangor, where they and their surplus stores were
disposed of.

A survey of the river St. John was made in the month of September with
the chain and compass from the mouth of Fish River to the intersection
of the meridian of the monument at the source of the St. Croix with the
St. John. This survey was afterwards extended eastward to the Grand
Falls, in order to connect with the astronomical station established
there, and westward to the mouth of the Alleguash, embracing a distance
of 87 miles. The islands were all surveyed, and the channels on either
side of them sounded.

The commissioner, having had other duties assigned him in reference
to the question of boundary, did not take the field in person until
September. Between the middle of that month and the middle of December
he was occupied in performing the field duties assigned him by the
Department of State.

The party conducted by him in person made the astronomical observations
for the determination of the latitude and longitude of the Grand Falls
of the St. John, and of the mouths of the Grand, Green, Madawaska, Fish,
and St. Francis rivers, all tributary to the St. John.

The same party also made a survey of the river St. Francis from its
mouth to the outlet