“_a b_ is a portion of the window-bar, to which level the fly was to be lifted, from his original position at F vertically beneath _a_; the spider’s first act was to descend halfway to the fly (to _d_), and there fasten one end of an almost invisible thread; his second to ascend to the bar and run out to _b_, where he made fast the other end, and hauled on his guy with all his might. Evidently the previously straight line must yield somewhat in the middle, whatever the weight of the fly, who was, in fact, thereby brought into position F´, to the right of the first one and a little higher. Beyond this point, it might seem, he could not be lifted; but the guy being left fast at _b_, the spider now went to an intermediate point _c_ directly over his victim’s new position, and thus spun a new vertical line from _c_, which was made fast at the bend at _d_´, after which _a d_ was cast off, so that the fly now hung vertically below _c_, as before below _a_, but a little higher.” “The same operation was repeated again and again, a new guy being occasionally spun, but the spider never descending more than about halfway down the cord, whose elasticity was in no way involved in the process. All was done with surprising rapidity. I watched it for some five minutes (during which the fly was lifted perhaps six inches), and then was called away.” * * * * * Without further burdening the argument with illustrative proof, it must now be evident that the “ore” out of which concepts are formed is highly metalliferous: it is not merely a dull earth which bears no resemblance to the shining substance smelted from it in the furnace of Language; it is already sparkling to such an extent that we may well feel there is no need of analysis to show it charged with that substance in its pure form—that what we see in the ore is the same kind of material as we take from the melting-pot, and differs from it only in the degree of its agglomeration. Nevertheless, I will not yet assume that such is the case. Before we can be perfectly sure that two things which seem to the eye of common sense so similar are really the same, we must submit them to a scientific analysis. Even though it be certain that the one is extracted from the other, there still remains a possibility that in the melting-pot some further ingredient may have been added. Human intelligence is undoubtedly derived from human experience, in the same way as animal intelligence is derived from animal experience; but this does not prove that the ideation which we have in common with brutes is not supplemented by ideation of some other order, or kind. Presently I shall consider the arguments which are adduced to prove that it has been, and then it will become apparent that the supplement, if any, must have been added in the smelting-fire of Language—a fact, be it observed, which is conceded by all modern writers who deny the genetic continuity of mind in animal and human intelligence.