Sonoma.--_May 24th_.--This morning at last saw us off. We left San Francisco shortly after seven, and embarked with our horses and baggage in a launch, which landed us at Sausalitto before ten. From thence we made our way to Sonoma, where we put up for the night. We formed quite a cavalcade, and presented a tolerably imposing appearance. First came the horses (six in number), which carried our baggage, camp equipments, etc. After these came José, Don Luis's Indian servant (who seems to be a far more lively fellow than Indians are generally), having these extra horses in his charge; and he really managed them admirably. For what with whistling, and coaxing, and swearing, and swinging his "riatta" over their heads, he had them as much under his command as ever a crack dragsman had his four-in-hand in the good old coaching times of my own dear England. We followed after, riding, when the road would admit of it, all abreast, and presenting a bold front to any gang of desperadoes who might be daring enough to attack us. There was little fear of this, however, for we hardly rode a mile without falling in with scattered parties bound to the gold mines. We made our way but slowly during the first portion of our ride, for the road wound up steep hills and down into deep hollows, but when at last we came upon a winding valley some miles in extent, our horses got over the ground in a style which only Californian steeds could achieve after the hard work which had already been performed. Towards evening, we crossed the hills which divided the valley from Sonoma plain, and on reaching Sonoma put up at an hotel recently opened here by a citizen from the United States, who coolly told us, in the course of conversation, that he guessed he didn't intend shearing off to the gold mines, until he had drawn a few thousand dollars from the San Francisco folk who pass through here to and from the diggings.