That portion of Alta California, where at present men’s conceptions are most vivid, and where at every corner, pass or avenue, the lively turn of the foot is seen, and where men’s views and feelings to-morrow will not be what they are to-day, and where also the sight of the golden streams from the Neveda mountains produce electrical shocks upon all persons, whose hearts are tund to chant the new and animating lays of later scenes of better days, and where nearly all of the “Elephant,” in his varied and portentous displays, is seen—may be comprisd within the small tract of country, over which the waters of the two principal rivers, Sacramento and St. Waukeen, flow. Along these waters, are several newly laid out towns, together with some of ancient Mexican date.

San Francisco is situated upon a side hill, on the south side of the bay of the same name. Its inhabitants were reckond, on the first of November, ’49, at 25,000, though six months before there were scarcely 5000. Such has been the rapid progress of San Francisco. The town is 10 or 12 miles within the entrance of the bay from the ocean.

At the head of Pablo bay, is a newly laid out town, calld Benetia. It lies on the north side of the strait between Pablo bay and Suisan bay. This strait will doubtless bear the name of Benetia. The town will ultimately be a pleasanter one than San Francisco. One mile east of Benetia, upon the same side of the strait, the United States have establishd an arsenal.

At the head of Suisan bay, is a new town calld Western New York. This town lies on the south side of the waters of the bay, upon, a flat piece of ground, at the lower confluence of the Sacramento and St. Waukeen. The delta between the upper and lower confluence, is about 20 miles in length. New York, situated as it is, will command the business of both rivers, and if it is lucky enough to avoid being inundated once a year, will ultimately be a place of considerable importance.

At the present head waters of navigation for the St. Waukeen, upon a slough about three miles distant from the river, is a town calld Stocton, the principal embarkadary for the south division of the mining district. This town is situated on low, flat ground, which rises but little above the waters of the river, at lowest stages. When the country around is overflowd with water, this town must necessarily suffer much inconvenience therefrom.

The last town which I shall here mention, is Sacramento city. Like Stocton, it is situated at the present head waters of the Sacramento river. It serves as the principal embarkadary for the northern mining region, as Stocton does for the south, and from this place, provisions and implements are carrid to all parts of the northern mining region. The place is more than half as large as San Francisco, and is fast improving.

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Before closing the subject of California, a few remarks concerning its bays and harbors may not be uninteresting.

The Bay of San Francisco is nearly surrounded by high hills, with a narrow entrance from the ocean, and now and then an island is interspersd, to hide the scenery of its waters from the hills contiguous to the town of San Francisco. It is large enough to contain the shipping of the whole world, and its waters are not of inconvenient depth for anchorage.

Next above this, lies Pablo bay, or Bay of St. Paul. It is inferior in size, but ships can anchor in any part of it, and lie at all times with a tolerable degree of safety.