Experimental biology, which lies at the root of most of the doctrines exposed in this work, depends on vivisection of animals. There are, however, very many persons who regard it as immoral to operate on living animals when it is not for the direct benefit of these. The attempts which have been made in France and Germany to prevent or to limit vivisection in laboratories have not succeeded, but in England there is a severe law controlling operations on animals and submitting them to oppressive regulations to which many of the scientific men in the country are opposed. The question of experiments upon human beings is still more delicate. Just as formerly the examination of a human corpse could be made only in secret, so at the present time, if the slightest experiment is to be made upon a human being, it can be only by devious ways. People who are hardly shocked at all at the numberless accidents caused by automobiles and other means of transit, or in field sports, make the strongest protest against any proposal to try some new method of treatment upon a human being. A large number of people, amongst them even men of science, regard as immoral any attempt to prevent the spread of venereal diseases. Recently, in connection with the investigations into the action of mercurial ointment as a means of preventing syphilis, the members of the Faculty of Medicine in France made a public protest, declaring that it would be “immoral to let people think that they could indulge in sexual vice without danger,” and that it was “wrong to give to the public a means of protection in debauch.”[226] None the less, other men of science, equally serious, were convinced that they were performing an absolutely moral work in attempting to find a prophylactic against syphilis which would preserve many people, including children and other innocent persons who, if no preventive measures existed, would suffer from the terrible disease.