<*oodb.] BOUNDARY LINES. 17 
(such as a portion of the western boundary of Idaho, which puns from 
a point in the channel of Snake River opposite the mouth of the Clear- 
water <lu«' north to the thirty-ninth parallel of Latitude), or a tangenl 
or arc of a circle (such as the western and northern boundary of Del- 
aware). 
Generally speaking, boundary lines of the first class need no mon- 
uments id indicate their local ion. while those of the second class must 
be pci-pei uated by marks of some kind after their posh ions have been 
j determined. 
The boundary line between Idaho and Montana is made up of two 
(sections, falling into the two classes mentioned. The first section is 
that part defined as the thirty-ninth meridian, between the interna- 
tional boundary and the summit of the Bitterroot Mountains; and 
the second section is the sinuous line corresponding to portions of the 
crest of the Bitterroot and Rocky mountains, this line beginning at 
the intersection of one meridian line and terminating at another 
meridian line. The first section has been located and marked by 
monuments, as will appear hereafter. The second section is consid- 
ered to be adequately determined, since it follows a watershed, and 
its terminal points have been marked — the northern one by the results 
of the survey under discussion, and the second by the results of the 
» survey of the western boundary of Wyoming, which line follows the 
I thirty-fourth meridian from the forty-fust parallel to the crest of 
the Rocky Mountains. The survey of the latter line was authorized 
; by an act of Congress approved March 3, 1873, and was made, under 
I contract, by Alonzo V. Richards, astronomer and surveyor, in June, 
July, August, and September, 1874. The following is a description 
of the corner of Idaho and Montana on this line, as taken from the 
report of the survey above referred to: 
At 245 miles 56 chains and 50 links the corner of Idaho and Montana was estab- 
lished on the crest of the Rocky Mountains. It is commemorated by a pine post 
11 feet long by ID inches in diameter, 3^ feet in the ground, marked on north face 
"34° W. L., 1874;" on south face, " 240 m. 56 chs. 50 Iks.: " on east face, " Wyom- 
I ing;" on southwest face, "Idaho; " on northwest face, " Montana; " and is squared 
2 feet at the upper end in the shape of a pentagon. The point is further per- 
petuated by a stone in the bottom of the pit in which this post was set. marked 
"A. V. R," with several charred blocks. A conical mound of earth and stone was 
raised 4 feet high by T feet in diameter, with a pit in he corner of each of the 
three Territories 3 feet square by 2 feet deep. Then, on the top of the mound, on 
the east side, was placed a flat sandstone, marked •• Wyoming:" another on the 
southwest side, marked "Idaho,*' and one on the northwest side, marked " Mon- 
tana." Nineteen pine trees are noted as witnesses to this post. 
It will be noted thai the Law provides for Locating points on the con- 
tinuation of the boundary Line along t he Bitterrool Mountains be1 ween 
Idaho and Montana. Ii was no1 possible to extend the triangulation 
beyond the southern extremity of the meridional portion of the bound- 
ary line, on account of the available funds not being sufficient for 
Bull. 170 2 
