=Sterilization Laws on Trial.--=It will be of great interest and instruction to see how extensively, in the various states which have recently passed sterilization laws, the experts selected will find it expedient to carry on sterilization, and what criteria they will use in deciding on individual cases. That sterilization can be put into effect is indisputable, as may be seen from the fact that several hundred operations have been performed in Indiana. If the board on whom the decision depends happens to be one which feels that many people are likely to distress themselves unduly over the border-line cases, and overlook the fact that there is always a goodly residue with which to proceed without great risk of mistake, then we may expect to see a vigorous campaign inaugurated, and those of us who are still undecided in the matter will have an opportunity of learning more certainly the merits or the failings of the scheme. Certain married degenerate types would seem to be the ones most urgently demanding attention. Having already begotten several defective children and with nothing else in prospect but the production of the same kind, it is difficult to see from any standpoint why a vasectomy on the male would not be a merciful act. There are not a few such families where the father is periodically in the hands of the law and yet not in permanent restraint. Once in custody his release could be made contingent on vasectomy. =An Educated Public Sentiment the Most Valuable Eugenic Agent.--=Coming now to the last proposition, education of the public in the principles of eugenics, this is the method calculated to be of more far-reaching service than any other, in the negative as well as in the positive phases of eugenics. Education is necessary before we can have effective restrictive measures for the mentally incompetent established and enforced, and it is also a prerequisite to intelligent procedure on the part of normal individuals in considering their own fitness for marriage. Of greatest importance in preventing undesirable marriages, as far as people of normal intelligence is concerned, will be the sentiment of disapproval which will arise on the part of society itself when it becomes really convinced that certain marriages are inimical to social welfare. Public opinion is, in fact, one of the most potent influences in marital affairs, simply because refusal to abide by the dictates of the community means social ostracism.