not shown some faculty in this direction." [68] "The difference is a very fundamental one," and "may be summed up in the words 'arrested development.'" Words, indeed! but what do they mean? They mean that these animals have not developed the faculties of speech and tool-making, which would have been most useful to them in the struggle for existence, the reason being _that they did not_; and this reason is exalted into a cause or law of "arrested development." Who or what arrested it? The advantage of the term is that it implies that they were on the point of developing, that they could "all but speak," were "trying to utter connected notes," were "but one step" behind flint axes, when some cosmic power said, "Hitherto shalt thou come and no further." If the dog had organs of speech or an instrument like the hand by which to place himself in closer relation to the outer world, he would doubtless be on a footing of mental equality with man, according to Mr. Laing. [69] The elephant's trunk accounts for his superior sagacity, and the horse suffers by his hoof-enclosed forefoot. [70] "Given a being with man's brain, man's hand, and erect stature, _it is easy to see_ how intelligence _must_ have been gradually evolved." [71] Now honestly it seems to us that many animals are as well provided as man is with a variety of flexible organs of communication with the outward world (for example, the antennae of insects, the prehensile tails of some monkeys, whose hands are as lithe as man's and articulated bone for bone and joint for joint). But letting this pass, we thought evolutionists allowed that structure is determined by function, rather than the converse; and so the confession that "it is not so easy to see how this difference of the structure arose," [72] surprises us, coming from Mr. Laing; though why this difference should exist at all, on evolution principles, is a far greater difficulty. Yet he confesses that "the difference in structure between the lowest existing race of man and the highest existing ape, [73] is too great to admit of one being possibly the direct descendant of the other." The ape, then, is not a man whose development is arrested. "The negro in some respects makes a slight approximation, ... still he is essentially a man, and separated by a wide gulf from the chimpanzee or gorilla. Even the idiot is ... an arrested man and, not an ape." [74]