492 GENERAL ORDER. 
expedition in charge of the observations, submit such other reports, and give, in his name, such 
directions as may be required. Corporal Cunningham and Artificer Smith, of the engineer 
detachment, are especially assigned to duty with Lieutenant Donelson. 
2. Lieutenants Grover and Mullan are placed in charge of the matnetic observations, and 
Mr. Stevens is relieved therefrom. Daily observations of declination, dips, and intensity, 
should be made whenever practicable. These observations, in importance and interest, are 
secondary to none in the expedition, and from the joint labors of Lieutenants Grover and Mul- 
lan the best results are expected. Private Roach, of the engineer detachment, is assigned to 
duty with these observations, as an aid. This opportunity must be availed of to acknowledge 
the services of Mr. Stevens in this department. 
8. Lieutenant Grover is also requested to make such astronomical observations as his time 
and circumstances will admit of, in order to be ready to take charge personally of all observa- 
tions on detached service, to which he at any moment may be assigned. Much is expected from 
his known energy, activity, and ability in all departments of the expedition. He is directed to 
do such reconnoitring as may be compatible with his other duties, and, by examination of 
enides and Indians, and particularly by a free interchange of views with the civil engineers, 
gain every possible information in reference to probable routes—reporting daily to the chief of 
the expedition in relation thereto. 
4, Mr. Stevens is continued on duty as the astronomer of the expedition. Great attention 
must be given to these observations, particularly those of lunar distances, and with the portable 
transit. This instrument should be mounted as often as practicable, and it is believed that on 
reaching Fort Benton, the longitude of that point, and the rates of the chronometers can by it 
be determined with great accuracy. 
Messrs. Doty and Graham are continued on duty in the astronomical department as assistants, 
and thanks are returned to them for the efficient aid they have already rendered. Mr. West is 
especially commended for his great patience and fidelity in the performance of his duty, and, 
with Private Wilson, of the engineer detachment, is also continued on duty as an aid. 
5. The meteorological observations are continued in charge of Mr. Moffett, with Mr. Burr as 
an assistant, and Artificers Davis and Lynt, and Private Broadwell, of the engineer detachment, 
as aids. Mr. Moffet’s industry, perseverance, and success in overcoming many practical dif- 
ficulties, and in faithfully making and recording a large number of observations, are acknow- 
ledged. In addition to faithfully assisting in the camp observations, Mr. Burr has, on detached 
duty, shown a high spirit, and rendered efficient service. ; 
6. The civil engineer party is placed on the following basis: Mr. Lander, with Mr. Evelyn 
as assistant, is charged with the duty of taking large views of country, with collecting inform- 
ation in reference to supplies, the location of the road, and questions of transportation, and, 
in connexion with data afforded by the odometer survey, and by detached parties, estimates and 
reports upon the general construction and location of the road. In these duties Mr. Tinkham 
will be associated with Mr. Lander. 
Mr, Lambert is placed in charge of the odometer survey, with Sergeant Collins, of the engi- 
neer detachment, as assistant topographer, and Mr. Bixby to run the compass line. The civil 
engineers and the topographer will make daily reports to the chief of the expedition. 
7. The artist and naturalist of the expedition will act under the immediate instructions of 
the chief of the expedition, who may, however, communicate instructions through the senior 
officer, Lieutenant Donelson. The same remarks will apply to the quartermaster and commis- 
sary agent of the expedition, Mr. Osgood, who will also, in relation to camps and marches, act 
under the immediate direction of the executive officer. Mr. Kendall is continued on duty, 
with Mr, Osgood as general assistant, and Corporal Coster, of the dragoon detachment, in the 
details of quartermaster and commissary duties. Mr, Adams, whose services as assistant topo- 
grapher from the Mississippi to Fort Union, both on the line of the odometer survey and on 
reconnaissance, have been of great value, is assigned to the artist as an assistant. Private 
