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Rh short. Now the mere sight of such a house would show that the plan is not a remnant of higher architecture, but a half-made invention. This is a fact in the line of progress, but not of decline. I have mentioned elsewhere a number of similar cases; thus the adaptation of a cord to the fire-drill is obviously an improvement on the simpler instrument twirled by hand, and the use of the spindle for making thread is an improvement on the clumsier art of hand-twisting; but to reverse this position, and suppose the hand-drill to have come into use by leaving off the use of the cord of the cord-drill, or that people who knew the use of the spindle left it off and painfully twisted their thread by hand, is absurd. Again, the appearance of an art in a particular locality where it is hard to account for it as borrowed from elsewhere, and especially if it concerns some special native product, is evidence of its being a native invention. Thus, what people can claim the invention of the hammock, or the still more admirable discovery of the extraction of the wholesome cassava from the poisonous manioc, but the natives of the South American and West Indian districts to which these things belong? As the isolated possession of an art goes to prove its invention where it is found, so the absence of an art goes to prove that it was never present. The onus probandi is on the other side; if anyone thinks that the East African's ancestors had the lamp and the potter's wheel, and that the North American Indians once possessed the art of making beer from their maize like the Mexicans, but that these arts have been lost, at any rate let him show cause for such an opinion. I need not, perhaps, go so far as a facetious ethnological friend of mine, who argues that the existence of savage tribes who do not kiss their women is a proof of primæval barbarism, for, he says, if they had ever known the practice they could not possibly have forgotten it. Lastly and principally, as experience shows us that arts of civilized life are developed through successive stages of improvement, we may assume that the