This greater mildness and equability of temperature on the Pacific Coast is to be ascribed to the winds and currents of the great ocean. During the summer the winds come from the northwest, and during the winter from the southwest and south. Much influence in tempering the cold of winter is ascribed also to the Japan Current, mentioned under a former head. It does for the Pacific Coast what the Gulf Stream does for England. The same causes regulate also the rainfall on the Pacific Coast. In one respect there is the same peculiarity along the whole coast, namely, dry summers and, comparatively, wet winters. There is, however, a gradual increase in the amount of rainfall northward from San Diego to Sitka; so that when we reach Washington Territory we do not find the excessive dryness which characterizes the summer climate of California. [Sidenote: Rainfall.] The figures of different authorities do not agree exactly as to the precipitation on the Pacific Coast: for example, in the older volume on Rain Tables, published by the Smithsonian Institution, the annual rainfall and melted snow on Puget Sound, measured at Steilacoom, near Olympia, from 1849 to 1867, amounted to 43.98 inches. Governor Semple, however, gives from Sergeant McGovern, in charge of the station, a total of 53.89 inches annually, measured at Olympia from 1878 to 1886. But I find in the report of the chief signal officer to the War Department for 1884, that the average from July 1, 1877, to December, 1883, for Olympia, was 62.81 inches. This difference of nine inches is partly accounted for by the fact that the precipitation in the subsequent years not included in the report of the Signal Service Bureau, namely, 1884, 1885 and 1886, averaged only 41.88 inches, which would, in great measure, relieve the discrepancy. It will probably turn out on further observation that 53 inches is about the total annual rainfall for Puget Sound. But according to the report of the chief signal officer for 1884, we have the following annual totals: San Diego, 9.40; San Francisco, 23.32; Portland, Oregon, 54.16; Puget Sound, 62.81; Sitka, Alaska, 97.28 inches. Comparing these with points farther east, we have Bismarck, Dakota, 21.35; Denver, 14.97; Sandusky, Ohio, 41.43; New Haven, Connecticut, 51.55; Norfolk, Virginia, 52.14 inches. The value of rainfall depends more on its distribution among the months than on its annual aggregate. England has but 25 inches rain per annum, but it comes at such times as makes it most effective. The rains on the Pacific Coast are not distributed in the most favorable way for agriculture--the summers being too dry. At San Diego there is less than one-third of an inch in the three summer months, and still less at San Francisco. On Puget Sound, for that time, the fall is 2.57. In Washington Territory the spring rains are as abundant as in the Atlantic States, and the summer breezes seem laden with moisture. [Sidenote: No blizzards or cyclones.]