We know exactly how to prevent syphilis in the male. Metchnikoff and Calmette have shown us by experimental proof that is irrefragable. That their method is impossible to apply satisfactorily in the female owing to anatomical reasons is no reason whatever for so solemnly concealing its existence from young men, because, if it were generally known to the male, the females would not be affected and the contagiousness of the disease would die out in one generation. It is painful to think of the vast mortality and misery that is caused by this one disease when every decent doctor knows exactly how to prevent it. With moral education in self-restraint together with application of Metchnikoff’s discoveries, which are known to every doctor, there is no reason whatever why syphilis should not be entirely abolished from the educated world. The other venereal diseases though serious are of comparatively minor importance; even gonorrhœa, which sterilises so many women and blinds so many babies, is less important because it does not affect the brain. My own opinion is, that while moral education should certainly be attended to, every boy should have a quiet talk with his doctor before he goes to boarding-school and still better perhaps before he goes to the university. It is common experience that more lads become infected while they are young and ignorant, during the time of their university life, than at any other time. We have apparently got over our post-war epidemic of influenza, which sensationally minded people called the Black Death without knowing what they said. But has fate altogether done with us? Has the war really left no other sequel than the influenza? Only this morning I was reading an article by Mr. Stephen Graham in the _Nineteenth Century and After_, in which he refers to the frightful post-war corruption of women in London, as shown by the mad competition among prostitutes for the favours of men. I can corroborate that article fully, for last year I went travelling over many parts of Europe, and I was impressed and horrified by exactly the same thing. A man cannot leave his hotel unaccompanied without being set upon by these women, who are evidently starving and desperate. London, Paris, and Rome are all the same; there is nothing to choose between them. Nothing seems to be done about this frightful menace. Let us take care lest a rival to the Black Death may ruin the people of Europe. Immorality must be paid for somehow; and it does no good for politicians to wrangle over trifles such as the German restitutions when there is a very much more dreadful menace knocking at the world’s doors.