“According to what is called the Darwinian theory, organisms are in fact precisely the result of a multiple integration of a complex function of a very great number of variables; many of such variables being bound together by relationships amongst themselves, an example of one such relationship being afforded by the law, which has been called ‘correlation of growth.’”

Next follows a rocket from Mr. Whitney’s armory:—

“As a linguist,” he says, “Professor Müller claims to have found in language an endowment which has no analogies, and no preparations in even the beings nearest to man, and of which, therefore, no process of transmutation could furnish an explanation. Here is the pivot on which his whole argument rests and revolves.”

So far, the statement is correct, only that I expressed myself a little more cautiously. It is well known, that the animals which in other respects come nearest to man, possess very imperfect phonetic organs, and that it would be improper, therefore, to refer more particularly to them. But, however that may be, I expected at all events some proof that I had made a mistake, that my argument jars, or my pivot gives. But nothing of the kind. No facts, no arguments, but simply an assertion that I do not argue the case with moderation and acuteness, on strict scientific grounds, and by scientific methods in setting up language as the specific difference between man and animals. And why? Because many other writers have adduced other differences as the correct ones.

There is a good deal of purely explosive matter in these vague charges of want of moderation and acuteness. But what is the kernel? I represented language as the specific difference between man and animals, without mentioning other differences which others believe to be specific. It would seem to show moderation rather than the absence of it, if I confined myself to language, to the study of which I have devoted the whole of my life; and perhaps a certain acuteness, in not touching on questions which I do not pretend to have studied, as they ought to be. But there were other reasons, too, which made me look upon language as the specific difference. The so-called specific differences mentioned by others fall into two classes—those that are implied by language, as I defined the word, and those which have been proved untenable by Mr. Darwin and others. Let us read on now, to see what these specific differences are:—

“Man alone is capable of progressive improvement.” Partly denied by Mr. Darwin, partly shown to be the result of language, through which each successive generation profits by the experience of its predecessors.
“He alone makes use of tools or fire.” The former disproved by Mr. Darwin, the latter true.
“He alone domesticates other animals.” Denied, in the case of the ants.
“He alone possesses property.” Disproved by every dog in-the-manger.
“He alone employs language.” True.
“No other animal is self-conscious.” Either right or wrong, according to the definition of the word, and never capable of direct proof.
“He alone comprehends himself.” True, implied by language.
“He alone has the power of abstraction.” True, implied by language.
“He alone possesses general ideas.” True, implied by language.
“He alone has sense of beauty.” Disproved or rendered doubtful by sexual selection.
“He alone is liable to caprice.” Disproved by every horse, or monkey, or mule.
“He alone has the feeling of gratitude.” Disproved by every dog.
“He alone has the feeling of mystery.” Cela me passe.
“He alone believes in God.” True.
“He alone is endowed with a conscience.” Denied by Mr. Darwin.

Did it show then such want of moderation or acuteness if I confined myself to language, and what is implied by language, as the specific difference between man and beast? Really, one sometimes yearns for an adversary who can hit straight, instead of these random strokes page after page.

The next attack is so feeble that I should gladly pass it by, did I not know from past experience that the very opposite motive would be assigned to my doing so. I had stated that if there is a terra incognita which excludes all positive knowledge, it is the mind of animals. How, then, I am asked, do you know that no animal possesses the faintest germs of the faculty of abstracting and generalizing, and that animals receive their knowledge through the senses only? I still recollect the time when any philosopher who, even by way of illustration, ventured to appeal to the mind of animals, was simply tabooed, and I thought every student of the history of philosophy would have understood what I meant by saying that the whole subject was transcendent. However, here is my answer: I hold that animals receive their knowledge through the senses, because I can apply a crucial test, and show that if I shut their eyes, they cannot see. And I hold that they are without the faculty of abstracting and generalizing, because I have here nothing before me but mere assertions, I know of no crucial test to prove that these assertions are true. Those who have read my Lectures, and were able to reduce them to a skeleton of logical statement, might have seen that I had adduced another reason, viz., the fact that general conceptions are impossible without language (using language in the widest sense, so as to include hieroglyphic, numerical, and other signs), and that as no one has yet discovered any outward traces of language among animals, we are justified in not ascribing to them, as yet, the possession of abstract ideas. This seems to me to explain fully “why the same person (viz., my poor self) should be involved in such profound ignorance, and yet have so complete a knowledge of the limits of the animal mind.” If I had said that man has five senses, and no more, would that be wrong? Yet having myself only five senses, I could not possibly prove that other men may not have a sixth sense, or at all events a disposition to develop it. But I am quite willing to carry my agnosticism, with regard to the inner life of animals, still further, and to say again what I wrote in my Lectures (p. 46):—

“I say again and again, that according to the strict rules of positive philosophy, we have no right either to assert or to deny anything with reference to the so-called mind of animals.”

But there is another piece of Chinese artillery brought out by Mr. G. Darwin. As if not trusting it himself, he calls on Mr. Whitney to fire it off—“The minds of our fellow men, too,” we are told, “are a terra incognita in exactly the same sense as are those of animals.”