From the earliest human record until now, the evidence is that dogs are still dogs, cats continue to be cats, and elephants have been and will always be elephants. Sterility continues to be the delimiting factor as to what constitutes a “kind.” This phenomenon makes possible, through the test of sterility, the determining of the boundaries of all the “kinds” in existence today. Through this natural test of fertilization it is possible to uncover the primary relationships within animal life and plant life. For example, sterility presents an impassable gulf between man and the animals. Breeding experiments have demonstrated that appearance is no criterion. Man and the chimpanzee may look somewhat similar, have comparable types of muscles and bones; yet the complete inability of man to hybridize with the ape family proves that they are two separate creations and not of the same created “kind.”
Although hybridization was once hoped to be the best means of bringing about a new “kind,” in every investigated case of hybridization the mates were always easily identified as being of the same “kind,” such as in the crossing of the horse and the donkey, both of which are members of the horse family. Except in rare instances, the mule thus produced is sterile and unable to continue the variation in a natural way. Even Charles Darwin was forced by the facts to admit: “The distinctness of specific forms and their not being blended together by innumerable transitional links, is a very obvious difficulty.” (Origin of Species, 1902, Part 2, p. 54) This still remains true.
Although hybridization was once hoped to be the best means of bringing about a new “kind,” in every investigated case of hybridization the mates were always easily identified as being of the same “kind,” such as in the crossing of the horse and the donkey, both of which are members of the horse family. Except in rare instances, the mule thus produced is sterile and unable to continue the variation in a natural way. Even Charles Darwin was forced by the facts to admit: “The distinctness of specific forms and their not being blended together by innumerable transitional links, is a very obvious difficulty.” (Origin of Species, 1902, Part 2, p. 54) This still remains true.
