3. The "South Branch," or "Wool-as-ta-qua-guam," to 5 miles above Bakers Lake and near to the exploring line of 1841 along the highlands claimed by Great Britain.
4. The "West Branch," or "Mat-ta-wa-quam," to its source in the highlands.
5. The "Northwest Branch" to its source in the highlands.
6. The "Big Black River," or "Chim-pas-a-ooc-ten," to its source.
7. The "Little Black River," or "Pas-a-ooc-ten."
8. The "Chim-mem-ti-cook River" as far as navigable.
The character of all these streams is the same—slack water of moderate depth alternating with rapids. They can never be navigated by anything larger than a bateau.
The method of survey was to trace the course of each stream by compass, estimating distances by the eye, or by pacing when the nature of the margin of the river would permit.
The average distance coursed per day was about 9 miles, and at the camps formed at night astronomical observations north and south of the zenith were made to determine their position in latitude, and observations for the local time to ascertain their differences of longitude.
Meridian observations of the sun were also made at a point intermediate to the camps whenever they could be obtained.