nd by one varying even in a slight degree from
that direction. This principle has already been exhibited in a striking
manner by the trace of the meridian line as far as it has now
progressed, for instead of encountering highlands in the latitude of
Mars Hill having a claim to be considered those described in the treaty
as the intended boundary between the two countries, the line as recently
traced actually passes that latitude at an elevation of less than
10 feet above the level of the monument, and the greatest elevation
encountered by this line in passing over any spur connected with Mars
Hill is 63 feet above the level of the monument. In advance of this spur
the line becomes again depressed below the level of the monument at
several points before it reaches the Aroostook.

These, however, are only a few of the many facts that might be adduced
from the surveys already made to show how important it is to the
question at issue that every necessary means to avail of the aids
of science should be adopted in order to preserve scrupulously the
direction specified in the treaty while tracing this line. It must also
be remembered that in the further prosecution of this duty a wilderness
has to be traversed, totally uninhabited and totally without roads. The
only means of progressing through it and of transporting the necessary
provisions and the instruments indispensable to accuracy will be by
means of canoes, for supplying two or three depots at points where Grand
River and the waters of the Restigouche intersect the line, leaving the
whole transportation along the meridian to be performed by packmen, or
men carrying burdens on their backs. That the usual avenue to give an
unimpeded view along the line must be opened through a dense forest,
which in the neighborhood of all streams crossing it will still be
found to consist of that swampy growth described in the report from the
undersigned of the 4th of January instant as requiring so much labor to
cut through it.

With all these circumstances in view, the following estimate for the
completion of the survey of the meridian line and for some further
surveys between that line and the source of the Aroostook is submitted;
and it is intended to embrace the expense of completing both the field
and the office wort that will require to be done in order to a final
accomplishment of the duties:

_Estimate for the meridian line_.

1. Pay of 4 assistant engineers from May 1,