- sands which exist in them, and through which the water
percolates.
The rivers of this Territory afford no fertilizing properties to the soil, but, on the contrary, are destitute of all substances. The temperature of the Columbia in the latter part of May was 42°, and in September 68°.
The rise of the streams flowing from the Cascade mountains takes place twice a-year, in February and November, from the rains; that of the Columbia in May and June, from the melting of the snows. Sometimes the rise of the latter is very sudden, if heavy rains occur at that period; but usually it is gradual, and reaches its greatest height from the 6th to the 15th of June. Its perpendicular rise is from eighteen to twenty feet at Vancouver, where a line of embankment has been thrown up to protect the lower prairie; but it has been generally flooded, and the crops in most cases destroyed. It is the intention to abandon its cultivation, and devote it to pasturage.
The greatest rise in the Willamette takes place in February; and I was informed that it rose sometimes twenty to twenty-five feet, {298} and quite suddenly, but soon subsides. It occasionally causes much damage.
Both the Willamette and the Cowelitz are much swollen by the backing of their waters during the height of the Columbia, and all their lower grounds submerged. This puts an effectual bar to their prairies being used for any thing but pasturage, which is fine throughout the year, excepting in the season of the floods, when the cattle are driven to the high grounds.
My knowledge of the agriculture of this Territory it will be well to mention, is derived from visits made to the various settlements, except Fort Langley and Fort Hall.
The Indians on the different islands in Puget's Sound
