There is certainly not one iota of evidence that the crossing of any two widely different human races will yield superior offspring in any respect and there are many indications that such intermixture lowers the average of the population. Our evidence derived from plant and animal breeding is also against pronounced crosses. The inferiority of the mongrel is universally recognized. No sane farmer, for example, would seek to improve his Jerseys or his Herefords by crossing one with the other. It is true that in pure breeds of plants and animals we sometimes venture on a cross to introduce some new desirable character but we follow up such mixture by a rigid selection in which is eliminated all but the rare individuals having the desired characteristics, and we continue this elimination generation after generation to fix our characters again. It is obvious that no such selection as this would be possible among the progeny of human crosses. It clearly becomes our duty then to determine as accurately as possible the degree of non-relationship between races it is inadvisable to transcend in inter-racial marriages. We are certainly taking great risks in accepting in any considerable numbers those races we can not assimilate to advantage into our own stock. =War.--=The deteriorating effect of war on national physique and vigor has been so frequently cited by eugenists[18] and is so obvious as scarcely to require further comment. It should be pointed out, however, that where, as is the case at present in Great Britain, armies are assembled from volunteers, instead of by conscription, there is the greatest danger from the eugenic standpoint, since not only physical but moral qualities are involved. For it is the brave, the generous, the individual with a high sense of duty who goes forward to the slaughter leaving the cowardly, the selfish or the indifferent to father the race. With the awful deadliness of modern warfare upon exhibition before our very eyes to-day, the extreme seriousness of such selective action must be evident to every thoughtful person. =Human Conservation.--=We talk much in recent years of _conservation_; but what are our forests and frontiers, our minerals and our waterways, compared with our national health and life-blood? No farmer would think of setting aside a diseased or physically defective _animal_ for breeding purposes, yet the same man together with the majority of mankind is wholly oblivious to similar faults when it comes to the mating of human beings. But is it not as important to look to fitness in man as in Poland China hogs or Holstein cows? Certainly the various strains are as marked and breed as true in the human family as in our live stock. Why face complacently in our own families what we would not tolerate in our piggery?