method of extremes we could get away from things that merge indistinguishably into other things. We find that every departure from one merger is entrance upon another. At the Cape of Good Hope, vast volumes of smoke from great manufacturing centers, as an explanation, cannot very acceptably merge with the explanation of extra-mundane origin—but smoke from a terrestrial volcano can, and that is the suggestion that is made in La Nature.
There is, in human intellection, no real standard to judge by, but our acceptance, for the present, is that the more nearly positive will prevail. By the more nearly positive we mean the more nearly organized. Everything merges away into everything else, but proportionately to its complexity, if unified, a thing seems strong, real, and distinct: so, in aesthetics, it is recognized that diversity in unity is higher beauty, or approximation to Beauty, than is simpler unity; so the logicians feel that agreement of diverse data constitute greater convincingness, or strength, than that of mere parallel instances: so to Herbert Spencer the more highly differentiated and integrated is the more fully evolved. Our opponents hold out for mundane origin of all black rains. Our method will be the presenting of diverse phenomena in agreement with the notion of some other origin. We take up not only black rains but black rains and their accompanying phenomena.
A correspondent to Knowledge, 5-190, writes of a black rain that fell in the Clyde Valley, March 1, 1884: of another black rain that fell two days later. According to the correspondent, a black rain had fallen in the Clyde Valley, March 20, 1828: then again March 22, 1828. According to Nature, 9-43, a black rain fell at Marlsford, England, Sept. 4, 1873; more than twenty-four hours later another black rain fell in the same small town.
The black rains of Slains:
According to Rev. James Rust (Scottish Showers):
A black rain at Slains, Jan. 14, 1862—another at Carluke, 140 miles from Slains, May 1, 1862—at Slains, May 20, 1862—Slains, Oct. 28, 1863.
But after two of these showers, vast quantities of a substance described sometimes as “pumice stone,” but sometimes as “slag,” were washed upon the sea coast near Slains. A chemist’s opinion is given that this substance was slag: that it was not a volcanic product: slag from smelting works. We now have, for black rains, a concomitant that is irreconcilable with origin from factory chimneys. Whatever it may have been the quantity of this substance was so enormous that, in Mr. Rust’s opinion, to have produced so much of it would have required the united output of all the smelting works in the world. If slag it were, we accept that an artificial product has, in enormous quantities, fallen from the sky. If you don’t think that such occurrences are damned by Science, read Scottish Showers and see how impossible it was for the author to have this matter taken up by the scientific world.
The first and second rains corresponded, in time, with ordinary ebullitions of Vesuvius.
The third and fourth, according to Mr. Rust, corresponded with no known volcanic activities upon this earth.
La Science Pour Tons, 11-26:
That, between October, 1863, and January, 1866, four more black rains fell at Slains, Scotland.
The writer of this supplementary account tells us, with a better, or more unscrupulous, orthodoxy than Mr. Rust’s, that of the eight black rains, five coincided with eruptions of Vesuvius and three with eruptions of Etna.
The fate of all explanation is to close one door only to have another fly wide open. I should say that my own notions upon this subject will be considered irrational, but at least my gregariousness is satisfied in associating here with the preposterous—or this writer, and those who think in his rut, have to say that they can think of four discharges from one far-distant volcano, passing over a great part of Europe, precipitating nowhere else, discharging precisely
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