There will be great difficulty in establishing and maintaining a post at the mouth of the Gila, until more knowledge is acquired of the navigation of the head of the gulf of California and the lower part of the Colorado. Transportation by land from San Diego is impossible for large quantities of stores. In the gulf, the winds blow in the winter almost invariably from the northward; and in the summer, when they come occasionally from southward, it is in violent gales, with severe squalls and thunder, rendering it very dangerous to be in the gulf then. In other words, it is always difficult to run up the gulf, but almost always easy to run south. These circumstances render the employment of steam vessels very advantageous. If the navigation of the gulf permits the Edith to be used she will answer, having both sails and steam. If she draws too much water, others of lighter draught could be procured. I mention this now, as the boundary commission will commence their labors on this end of the line, and will be on the Gila next season. I should have observed that the Colorado is supposed to be navigable only for boats drawing three or four feet. I see no reason for posting troops on any other point out of reach of the ports on the Pacific. The Indians in the interior do not make it necessary, and it would be useless to place them near the mines to maintain order there. Nothing but the establishment of a regular civil government, to be carried on by those most interested in the existence of good order, will answer that end. Such detachments as go to the southern part of the Territory will accordingly be placed, as heretofore mentioned, in healthy and convenient positions, and those on this bay at such points as will combine good climate, convenience of supply, and facility of movement. I propose, when such a point is found, to have removed all the public stores there, both from this place and Monterey, leaving the heavy ordnance and stores.