APPENDIX. 521 



waters, called on the map " Pitt River." From this position and 

 others you will get a view of the different mountains, particularly the 

 Shaste Peak, the most southern one in the territory of Oregon. 



Your attention, besides being directed to the rivers, will embrace 

 as much of the surrounding country as possible, in order to afford the 

 fullest information relative thereto, including soil, timber, &c. 



On your arrival at the anchorage off Molate, you will select a 

 place, with Lieutenant Carr, for the observatory ; and he will super- 

 intend the landing and putting up of the transit for observations of 

 moon culminating stars, and the rating of the chronometers. The 

 magnetic instrument of Gauss, and likewise the meteorological instru- 

 ments, will be put up, that the usual and regular observations may go 

 forward. 



The preserved meats and cranberries on board the Vincennes are 

 not to be used except for the sick, and no grog is to be served to the 

 crews of boats on surveying duty ; but they must be regularly supplied 

 with their rations. 



The crews of boats on surveying excursions will have their allow- 

 ance of beef and pork increased one-half. 



The five boats that accompany you will be placed under charge 

 of Lieutenants Alden and Budd, Passed Midshipman Sandford, and 

 Midshipmen Hammersly and Elliott; and the launch, under charge of 

 Mr. Williamson, will also be taken to carry provisions and tents. 



Observations for chronometers and equal altitudes will be taken the 

 day of your arrival, if possible, together with circummeridian obser- 

 vations, and transit bearings obtained, to ascertain the accuracy of 

 Beechey's survey, which you will apply to his chart, if two or three 

 can be obtained at or near the same spot (by looking at the chart 

 several meet my eye near the island of Los Alcatrazes, with it and the 

 surrounding points and headlands) ; and it would be well to send an 

 officer (Mr. Totten) there to obtain a round of angles, and at the same 

 time get observations for time. 



Dr. Pickering will accompany the expedition of boats, and Lieutenant 

 Case, Acting Master Totten, and Passed Midshipman May, be employed 

 plotting. 



I enclose a memorandum for Lieutenant Carr, which you will hand 

 to him when you leave the ship. 



I am, &c, 



Charles Wilkes, 

 Commanding Exploring Expedition. 



Lieut. Com. C. Ringgold, 



U. S. Brig Porpoise. 



VOL. V. 2 T 2 66 



