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tStation No. 80.

intersection of azimuth lines observed from various points in surveying a portion of the highland boundary. The longitude referred to Taschereau's House.

Position determined approximately by Lieut. Emory, T. E., by the

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81 Moose River, Post-office, Lowell's house,

*80 Moose Hill, Highland Boundary,

82 Portland, Senter's old Observatory, Cumberland St., cor. Boyd St., Me

83 Portland, dome of the Exchange,

Maine and Canada line.

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84 Portland, centre of the Town Hall,

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90 Taschereau's House, Highland Boundary on the Kennebec and Quebec road,

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Canada.

91 Taschereau's House, large iron boundary monument, No. 351 on the Highland,

Maine and Canada line.
Me.

92 Waterville, intersection of Main and Silver Streets,

PART III.

+93 Albany, the State Capitol,

94 Albany, the Academy,.

N. Y.

N. Y.

$95 Canaan, Major Graham's Astronomical Observatory, Vt. & Can. line. 96 Canaan, boundary monument on Hall's stream, Vt. & Can. line. 97 Hall's Stream (a tributary to the Connecticut River), upper

cape at the mouth of,

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98 Hall's Stream, the middle of the bridge near the mouth of,
99 Hall's Stream, Beacher's dwelling-house near the mouth of, .
100 Jay Mountain (of the Green Mountain range), the summit of,
4,030 feet above the ocean level,

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T101 Montreal, Astronomical Station of Captain Robinson, Royal

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a107 Owl's Head (west shore of Lake Memphremagog), the sum

mit of, 2,558 feet above the ocean level,

C. E

* Determined by Lieut. W. H. Emory. The longitude was derived by him from a comparison with Major J. D. Graham's meridian of Taschereau's House, as given in No. 90. + Station No. 87.- Position deduced approximately by Captain Robinson, R. E., and Lieut. Emory, T. E., as in the case of No. 80.

Stations Nos. 93 and 94. — These longitudes are derived from chronometrical connections with my primary meridian at Rouse's Point, by means of the transmission of many chronometers forth and back. The necessary time-observations were made at East Albany by my assistant, Lieut. George Thom of the Topographical Engineers; those at Rouse's Point were made by myself.

Station No. 95. Canaan, Vermont and Canada Line. -The latitude of this point was determined by me from observations of the transits of stars, east and west, over the prime vertical. Some of these were made when the thermometer stood at 25° below zero of Fahrenheit's scale. The lowest degree observed was 34° below zero of Fahrenheit, in December, 1845, when we were living in tents in the open field. The longitude was derived from chronometrical connection with my meridian of Rouse's Point. The first step in this connection was with Stanstead, in regard to which see remarks on that station, No. 118. The second step was a chronometrical connection between Stanstead and Canaan by the transmission, forth and back, of many chronometers. For this part of the operation, Lieut. Whipple, U. S. T. E., was placed in charge of the Stanstead station (after Captain Robinson had left it for other duties), and the requisite time-observations were made by him there, and by myself at the boundary station at Canaan.

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Station No. 100. Jay Mountain. -This position is given as derived by my assistants on the Boundary Survey under the Treaty of Washington, Lieuts. George Thom, and A. W. Whipple, Topographical Engineers, by trigonometrical connections with the astronomical stations at Richford in Vermont and Stanstead in Canada East. The elevation was derived by Lieut. Whipple by trigonometrical measurement referred to the elevation of the surface of Lake Memphremagog. The longitude is ultimately based on a reference to my meridian of Rouse's Point.

¶ Stations Nos. 101, 102, 103.-The latitudes here given are exclusively the determinations of Captain William F. Robinson of the Royal British Engineers, who was attached, on the part of that government, to the survey of the Boundary under the Treaty of Washington. The longitudes are based upon that of Rouse's Point as determined by myself. The connection was made by thirty-two comparisons derived from the transmission, forth and back, of U. S. chronometers between Rouse's Point and St. Helen's Island. The necessary time-observations were made at St. Helen's Island by Captain Robinson, R. E., and at Rouse's Point by myself.

a Station No. 107. Owl's Head. This position is the determination of Lieut. A. W. Whipple, T. E., by trigonometrical connection with the astronomical station at Stanstead in Canada East, and, in elevation, with the level of Lake Memphremagog. The longitude rests upon comparisons with the meridian of Rouse's Point according to my determination of its longitude.

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108 Richford, Lieut. Thom's Astronomical Station,

109 Richford, the boundary monument No. 602, distant 2,412 feet

due N. of Lieut. Thom's Astronomical Station,

110 Richford, the Village brick church,

111 Rouse's Point, the prime vertical transit stand of Major Graham's Astronomical Observatory,

112 Rouse's Point, the centre of Fort Montgomery,

113 Rouse's Point, the sulphur spring,

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N. Y.

N. Y.

N. Y.

N. Y.

114 Rouse's Point, the stone church at Rouse's Point Village, 115 Rouse's Point, the stone monument on the boundary-line at Webb's house, New York and Canada line. 116 Rouse's Point, the stone monument inscribed " Latitude 45°, J. D. Graham, 1845," which marks the parallel of 45° of latitude, +117 St. Regis, the boundary monument No. 774, on the southeastern shore of the River St. Lawrence, N. Y. and Canada line. 118 Stanstead, east shore of the Lake Memphremagog, Astronomical Station,

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119 Stony Point, west shore of Lake Champlain,

120 Wind-Mill Point, eastern shore of Lake Champlain,

PART IV.

121 Albany (sometimes called New Albany), the intersection of
Maple and Main Streets,

122 Armstrong (Fort), on the lowest or west end of Rock Island,
123 Ashtabula, centre of the North Public Square, or Park,
124 Camanche, intersection of Main and Maxan Streets,
125 Camanche, flag-staff on Chicago Street, about one hundred
yards west of the shore of the Mississippi River,

126 Chicago, dome of the City Hall, or Court-House,
127 Chicago, steeple of the Roman Catholic Church of the Holy
Name on Wolcott Street, between Huron and Superior Sts.,
128 Chicago, the new iron Light-House, erected at the east end
of the North Harbor pier, by Lieut.-Colonel J. D. Graham,
and first lighted June 29th, 1859,

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$129 City of Rock Island," the centre of Washington Square
(called on some of the older maps, "Church Square"),
130" City of Rock Island," dome of the Court-House on Orleans
Street, between Elk and Deer Streets,

131 Cleveland, the New Court-House,.
132 Cleveland, the Light-House on the hill,

N. Y.

C. E.

N. Y.
Vt.

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*Stations Nos. 108, 109, 110. Richford, Vermont. The latitudes here given are the determinations, under my orders, of Lieut. George Thom, T. E., by observations of the transits of stars, east and west, over the Prime Vertical plane. The longitudes are derived from chronometrical connection by observing night signals made by flashing small charges of gunpowder-with my primary meridian at Rouse's Point, whose longitude, as determined by me, is given in No. 111 of this Table. The necessary timeobservations were made at Richford by Lieut. Thom, and at Rouse's Point by myself.

Station No. 117. St. Regis.-The latitude of this station is exclusively the determination of the late Lieut. J. H. Pipon of the Royal British Engineers, attached, on the part of that government, to the Boundary Survey under the Treaty of Washington. The longitude was derived from chronometrical connection by observing gunpowder signals at night-with the meridian of Rouse's Point, taking my determination thereof. The requisite time-observations were made at St. Regis by Lieut. Pipon, and at Rouse's Point by myself.

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Station No. 118. Stanstead, Canada East. This station was first occupied by Captain William F. Robinson, R. E. Its latitude, here given, is his determination. It was afterwards verified by Lieut. A. W. Whipple, U. S. T. E, by observing the transits of stars over the prime vertical, east and west. The longitude was derived from chronometrical connection by observing gunpowder signals at night-with the meridian of Rouse's Point as determined by myself. The requisite time-observations were made at Stanstead by Captain Robinson, and at Rouse's Point by myself.

All the other determinations, both in latitude and longitude, are my own.

"Rock Island City," (No. 170,) and "The City of Rock Island," (No. 129,) must not be confounded under names so nearly alike. The "City of Rock Island" is on the left bank of the Mississippi River, opposite to Davenport. "Rock Island City" is on Rock River, about three miles south from the "City of Rock Island."

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