_The relative influence_ of the male and female parents upon the characteristics of progeny has long been a fruitful subject of discussion among breeders. It is found in experience that progeny sometimes resembles one parent more than the other--sometimes there is an apparent blending of the characteristics of both--sometimes a noticeable dissimilarity to either, though always more or less resemblance somewhere--and sometimes the impress of one may be seen upon a portion of the organization of the offspring, and that of the other parent upon another portion; yet we are not authorized from such discrepancies to conclude that it is a matter of chance; for all of nature's operations are conducted in accordance with fixed laws, whether we be able fully to discover them or not. The same causes always produce the same results. In this case, not less than in others, there are, beyond all doubt, certain fixed laws; and the varying results which we see are easily and sufficiently accounted for by the existence of conditions or modifying influences not fully open to our observation. It may be stated, on the whole--as a result of the varied investigations to which this question has given rise--that the evidence, both from observation and the testimony of the best practical breeders, goes to show that each parent usually contributes certain portions of the organization to the offspring, and that each has a modifying influence upon the other. Facts also show that the same parent does not always contribute the same portions, but that the order is at times, and not rarely, reversed. Where animals are of distinct species or breeds, transmission is usually found to be in harmony with the principle, that the male gives mostly the outward form and locomotive system, and the female chiefly the interior system, constitution and the like. Where the parents are of the same breed, it appears that the proportions contributed by each are governed, in a large measure, by the condition of each in regard to age and vigor, or by virtue of individual potency or superiority of physical endowment. This potency or power of transmission, seems to be legitimately connected with high breeding, or the concentration of fixed qualities, obtained by continued descent for many generations from such only as possess in the highest degree the qualities desired.