Physicians have found the appendix very useful in preventing constipation, which its removal usually increases. If we only knew enough, we would, no doubt, discover a beneficial use for all the so-called vestigial organs. Our ignorance is no argument against the wisdom of their creation. The claim that human hair is vestigial is spoiled by the fact that there is none on the back where most abundant on simians. 33. SEROLOGY, OR BLOOD TESTS They tell us that the blood of a dog injected into the veins of a horse, will kill the horse, whereas the blood of a man injected into the veins of an ape results in very feeble reaction, which proves that the dog and the horse, they say, are not related by blood, while the man and the ape are so related. But a distinguished authority says, “The blood of the dog is poisonous to other animals, whilst, on the other hand, the blood and the blood serum of the _sheep, goat_ and _horse_, have generally little effect on other animals _and on man_. It is for this reason that these animals and particularly the horse, are used in preparation of the serums employed in medicines.” It is also stated as a fact that mare’s milk more nearly resembles human milk than that of any other animal save the ass, a nearly related species—to the mare, let us hope, not to us. Because of this resemblance, it is reported by Dr. Hutchinson that, “One of the large dairy companies in England now keeps a stock of milch asses for the purpose of supplying asses’ milk for delicate human babes.” These well-known facts would prove the horse and the ass a nearer relative than the ape, since serums are not made from the blood of the ape. We prefer the innocent sheep to the ape as our near relative, and will allow the evolutionists to claim the goat. Dr. W. W. Keen, Prof. Emeritus of Jefferson College, Phila., in his book, “I believe in God and in Evolution,” on p. 48 says, “Here again you perceive such identity of function, that the thyroid gland of animals, when given as a remedy to man, performs precisely the same function as the human thyroid. Moreover, it is not the thyroid gland from the anthropoid apes that is used as a remedy but that from the more lowly sheep.” Again the force of Dr. Keen’s argument goes to prove, so far as it has any weight, that we have a nearer kinship to the sheep than the ape. Children are nourished by the milk of the cow, the ass and the goat, not of the ape. Vaccine matter is taken from the cow and serums from the horse, not from any species of monkey, to which we do not seem to be related at all.