appearances alone.” Therefore I conclude, without further discussion, that in the terminology of Locke the word abstraction is applied only to those higher developments of the faculty which are rendered possible by reflection. Now, on what does this power of reflection depend? As we shall see more fully later on, it depends on Language, or on the power of affixing names to abstract and general ideas. So far as I am aware, psychologists of all existing schools are in agreement upon this point, or in holding that the power of affixing names to abstractions is at once the condition to reflective thought, and the explanation of the difference between man and brute in respect of ideation. It seems needless to dwell upon a matter where all are agreed, and concerning which a great deal more will require to be said in subsequent chapters. At present I am only endeavouring to ascertain the ground of difference between those psychologists who attribute, and those who deny to animals the faculty of abstraction. And I think I am now in a position to render this point perfectly clear. As we have already seen, and we shall frequently see again, it is allowed on all hands that animals in their ideation are not shut up to the special imaging (or remembering) of particular perceptions; but that they do present the power, as Locke phrases it, of “taking in and retaining together several combinations of simple ideas.”[21] The only question, then, really is whether or not this power is the power of abstraction. In the opinion of some psychologists it is: in the opinion of other psychologists it is not. Now, on what does an answer to this question depend? Clearly it depends on whether we hold it essential to an abstract or general idea that it should be incarnate as a word. Under one point of view, to “take in and retain together several combinations of simple ideas,” is to form a general concept of so many percepts. But, under another point of view, such a combination of simple ideas is only then entitled to be regarded as a concept, when it has been conceived by the mind _as_ a concept, or when, in virtue of having been bodied forth in a name, it stands before the mind as a distinct and organic offspring of mind—so becoming an object as well as a product of ideation. For then only can the abstract idea be known _as_ abstract, and then only can it be available as a definite creation of thought, capable of being built into any further and more elaborate structure of ideation. Or, to quote M. Taine, who advocates this view with great lucidity, “Of our numerous experiences [_i.e._ individual perceptions of a show of araucarias] there remain on the following day four or five more or less distinct recollections, which obliterated themselves, leave behind in us a simple, colourless, vague representation, into which enter as components various reviving sensations, in an utterly feeble, incomplete, and abortive state. But