I am, sir, with great respect,
Your obedient servant,
MALCOLM DOUGLASS.
V.
Results of Observations for Latitude and Longitude during the Expedition 820.By David B. Douglass, Capt. Engineers, U.SA.
| By 3 sets of observations at Cunningham'sIsland, 1819, and reduced byexact measurement on the Boundary Bay | ||||
| By 1 set of observations at GibraltarIsland (Put-in Bay), taken, like thepreceeding, in 1819, and reduced as before | ||||
| Mean latitude of Detroit | By 1 set of observations taken onSugar Island, and reduced as before | 42° 19 ´ 20 ´´ | ||
| By mean results of 2 sets of observations17 and 21, 1820 | ||||
| By mean observation, Sept. 29, 1820 | ||||
| Mean longitude of Detroit, by 6 sets ofobservations, May 17 and 19, 1820 | 82 39 00 | |||
| Latitude of Presque Isle, Lake Huron, June 5, 1820 | 45 19 45 | |||
| Latitude of Mackinaw, by 4 sets of observations,June 7 and 11, 1820, by meridian observations,Sept. 12, 1820 | 45 50 54 | |||
| Height of Fort Holmes. From the water to the brow of the hill near Robinson'sFolly, nearly on a level withFort Mackinaw | 115.8 | |||
| Thence to the top of the block H of FortHolmes | 260.9 | |||
| Total height, | 376.7 feet | |||
| Longitude of Mackinaw, by several sets of observations,Sept. 12, 1820 | 84° 28´ 40´´ | |||
| Mean latitude of Sault de St. Marie, June 16, 1820 | 46 26 45 | |||
| Latitude of Turtle Camp, on Lake Superior, June22—primitive bluff (Granite Point.—S.) | 46 41 15 | |||
| Latitude of Keweena Camp | 47 02 30 | |||
| Mean latitude of Sandy River, July 4, 1820 | 46 55 24 | |||
| Mean longitude (by 25 observations for degrees,and 25 observations for time). In time, 6 h. 3 m.48 sec. In degrees | 90 57 00 | |||
| Latitude of the gallais[ [203] on the Grand Portage ofSt. Louis, July 6, 1820 | 46 39 34 | |||
| Latitude of camp at head of Grand Portage, July8, 1820 | 46 41 07 | |||
| Latitude of camp at west end of Savanna Portage | 46 51 47[ [204] | |||
| Mean latitude of Sandy Lake post, from observations,July 16 and 25 | 46 45 35 | |||
| Mean longitude of Sandy Lake post, from 4 setsof observations, July 15 and 16 | 93 21 30 | |||
| Latitude of Wolverine Camp, July 23, 1 day fromSandy Lake | 47 4 15 | |||
| Latitude of halting-place above forks of LeechRiver on the Mississippi, July 20 | 47 24 00[ [205] | |||
| Latitude of camp at Lake Winnipec, July 20 | 47 30 56 | |||
| Latitude of halting-place near first return camp,July 21 | 47 27 10 | |||
| Latitude of return camp; near the above, sameday | 47 26 40 | |||
| Latitude of camp at Buffalo hunting-ground, abovePe-can-de-quaw Lake, July 28 and 29 | 46 00 00 | |||
| Breadth of river at camp on the Buffalo Plain,148 yards | ||||
| Latitude of halting-place between the Great Fallsand St. Francis River | 45 25 43 | |||
| Breadth of river at camp above Falls of St. Anthony,200 yards | ||||
| Mean latitude of Fort St. Anthony, new site, July31, by 5 sets of observations | 44 53 20 | |||
| Mean longitude of Fort St. Anthony, new site, July31, by 3 sets of observations | 92 55 45 | |||
| Latitude of Fort Prairie du Chien, Aug. 6 and 7. | 43 03 19[ [206] | |||
| Latitude of Fox and Ouisconsin Portage, Aug.14 and 15, 43° 42´ 36´´; say | 43 42 00 | |||
| Latitude of camp near mouth of River De Loup,Aug. 17 | 44 6 44 | |||
| Latitude of Fort Howard, Green Bay, Aug. 21 | 44 31 38 | |||
| Longitude of Fort Howard (some error), probablybetween 87° 45´ 30´´ and | 87 46 00 | |||
| Latitude of camp at Sturgeon Portage, Lake Michigan,Aug. 23 | 44 47 43 | |||
| Latitude of camp 3 miles north of the Manetowag,Aug. 24 | 44 12 47 | |||
| Latitude of camp south of the Sheboyegan, Aug. 25 | 43 41 26 | |||
| Latitude of camp at Milwaukie, Aug. 26 | 43 01 35 | |||
| Mean latitude of Fort Dearborn, Chicago, by 6 setsof equal altitudes, Aug. 31, and meridian altitude | 41 54 06 | |||
| Mean longitude of Fort Dearborn, 3 sets of observations.In time, 5 h. 50 m. 8 sec. In degrees | 87 32 30 | |||
| Longitude of Detroit, calculated from above | 82 54 53 | |||
| Latitude of camp near head of Lake Michigan,Aug. 31 and Sept. 1 | 41 38 48 | |||
| Mean latitude of the extreme south point of LakeMichigan, 4 sets of observations and meridian observation | 41 37 28 | |||
| Latitude of camp next north of the St. Joseph's,near Kekalamazo, Sept. 3 | 42 32 16 | |||
| Latitude of camp at Maskegon River, Sept. 4 | 43 13 41 | |||
| Latitude of camp near Point aux Salles, LakeMichigan, Sept. 5 | 44 5 17 | |||
| Latitude of camp at Grand Traverse Bay, LakeMichigan, Sept. 7 | 45 34 24 | |||
3. MINERALOGY AND GEOLOGY.
VI.
Report on the Copper Mines of Lake Superior. By Henry R. Schoolcraft.
To the Hon. John C. Calhoun, Secretary of War.
Vernon (Oneida County, N. Y.), November 6, 1820.
Sir: I have now the honor to submit such observations as have occurred to me, during the recent expedition under GOV. Cass, in relation to the copper mines on Lake Superior; reserving, as the subject of a future communication, the facts I have collected on the mineralogy and geology of the country explored generally.