The late Sir Charles Lyell mentions in his Antiquity of Man how Dr. Sumner, the late Archbishop of Canterbury, brought out in strong relief fifty years ago, in his Records of Creation, one essential character separating man from the brute. As the same argument is still being "brought out," and is, on the face of it, exceedingly plausible, and as the answer to it has to do with the brain, it cannot be passed over. Dr. Sumner said: "It has been sometimes alleged, and may be founded on fact, that there is less difference between the highest brute animal and the lowest savage than between the savage and the most improved man. But, in order to warrant the pretended analogy, it ought to be also true that this lowest savage is no more capable of improvement than the chimpanzee or orang-outang." This objection is met by some such consideration as the following:--When you examine the enormous difference in the formation of the skull in man and ape (look, for instance, at plate xvii., vol. ii. of Haeckel's Evolution of Man), and when you remember that this sets hard at an early date, you surely have a good reason for limited improvability. Further, the brain of even the lowest savage represents a development of some half a million years above the ape along the line of intelligence. How, then, can we dream of making this up in one or a few generations by artificial training of the ape? Lastly, we have the enormous leverage of language, the inherited wealth of thousands of speaking generations, and an incalculable aid to thought. How much is the intelligence of the Microcephalæ, the clucking "small heads" lately on show at the Hippodrome, capable of rapid improvement? Our experiments do not show that the ape is not improvable, but only that we cannot, in a single generation, lift it over a gulf representing 500,000 years of human development. How can we expect it? The Blood.--In the last few years an astonishing confirmation of our relationship to the anthropoid ape has been discovered. We are blood relations. Elie Metchnikoff, Professor at the Pasteur Institute, shows this clearly in his book, The Nature of Man. [167] Until quite recently it was not known how to distinguish human blood from that of other mammals. A method giving conclusive results has now been discovered, and is used in forensic medicine. The same method has been employed in comparing the blood of man and the anthropoid apes, resulting in the discovery [168] that, in their case, there is practically no blood difference whatever! THE REVELATIONS OF EMBRYOLOGY. The opponents of Evolution used to appeal to the special features of human embryology, which were supposed to distinguish man from all the other mammals; but in 1890 Emil Selenka proved that the same features are found in anthropoid apes, especially in the orang, while the lower apes are without them.