The choice of routes by which you will enter California will be left to your better knowledge and ampler means of getting accurate information. We are assured that a southern route (called the caravan route, by which the wild horses are brought from that country into New Mexico) is practicable, and it is suggested as not improbable that it can be passed over in the winter months, or at least late in autumn. It is hoped that this information may prove to be correct. [Illustration: GAMBLING SCENE AT SAN FRANCISCO.] In regard to the routes, the practicability of procuring needful supplies for men and animals, and transporting baggage, is a point to be well considered. Should the President be disappointed in his cherished hope that you will be able to reach the interior of Upper California before winter, you are then desired to make the best arrangement you can for sustaining your forces during the winter, and for an early movement in the spring. Though it is very desirable that the expedition should reach California this season, (and the President does not doubt you will make every possible effort to accomplish this object), yet if, in your judgment, it cannot be undertaken with a reasonable prospect of success, you will defer it, as above suggested, until spring. You are left unembarrassed by any specific directions in this matter. It is expected that the naval forces of the United States which are now, or will soon be in the Pacific, will be in possession of all the towns on the seacoast, and will co-operate with you in the conquest of California. Arms, ordnance, munitions of war, and provisions to be used in that country, will be sent by sea to our squadron in the Pacific for the use of the land forces.