So far as the work of research into the phenomena of life is concerned, there can be no question as to its importance or as to the fitness of sacrificing the lives of the lowlier creatures in any way that may be necessary for the advancement of knowledge. In the last half century there has been an improvement in the treatment and prevention of diseases so great as almost to defy adequate description. To take only the last of these precious gains, that in relation to the treatment of diphtheria, the gain has been such that although the process is not past its experimental stage the reduction of the mortality in hospitals where the remedy is used has lowered the death rate from above fifty to about fifteen per cent. of the cases. Yet this result rests upon a vast amount of experiment which has cost suffering and life to the lower animals; and to produce the remedy which is used, horses have to be innoculated with the disease, and thereby much pain is inflicted upon them. Weighed as against the life of a human being, a host of the lower creatures must count as nothing. As all human advancement depends upon the dissemination of knowledge, it is difficult to see any objection, from the point of view of justice, to the use of the lower creatures to accomplish this end. The only real point in the matter is as to the effect of such scenes on the minds of young people; yet they have to be accustomed to behold the processes of destruction of life which are everywhere going on about them. The gardener maintains his work by endless slaying. Our tables bear the products of the slaughter-houses. While the anatomist's work may be revolting, it is only so because his tasks are done deliberately and for a purpose that is not yet properly appreciated.