Nor do these figures afford a complete view of the extent to which marital infelicity obtains in the United States. Every year thousands of marriages virtually, or actually, terminate without recourse to the courts. Men and women who have entered into the marriage state really in love with each other, develop so-called "incompatibilities of temperament" which transform love into indifference, even hate. Reluctant to seek divorce--perhaps conscientiously opposed to it--they continue to live together, husband and wife in name only, or they arrange a voluntary separation. Many others escape from what they have come to regard as an intolerable yoke by the easy expedient of desertion, not necessarily followed by court proceedings. It is impossible to give exact figures, but unquestionably the number of marriages which collapse in divorce is a comparatively small proportion of all unhappy marriages. Taking the increase in divorce, however, as a concrete, definite measure of marriage failure, the problem of explanation and remedy remains obviously and sufficiently urgent. And it must be said that as a rule the offered solutions are either evasive or superficial. Some investigators, despairing of finding any solution, insist that the increase in divorce is an unavoidable product of the complex, strenuous life of modern civilisation. Others, much of the same mind, advocate "trial marriages" as a palliative. Still others, singularly lacking in courtesy, or of a myopic vision so far as women are concerned, throw the blame on the "feminist movement," on the increasing emancipation of woman from her old-time position of slavish inferiority. Finally, there are investigators who, noting that the increase in divorce has steadily been gaining momentum since the Civil War, attribute this to the difference in economic conditions before and after the war. In effect, they say that there are more divorces because the country is wealthier, the inference being that increased national prosperity has had an unsettling effect on the national life. That this contention is sound cannot be gainsaid; but it does not go deep enough. Of itself, it no more explains the increase in divorce than it does the increase in crime and the increase in mental and nervous disease, equally in evidence since the Civil War. These, too, there is warrant for affirming, have increased because of changed economic conditions. It remains, however, to ascertain the precise factor or factors brought into operation by this economic change to account for the growth in crime, insanity, nervous troubles, and divorce. And, in this connection, it is most interesting and important to observe that, so far as concerns crime, insanity, and nervous troubles, recent research has made clear exactly why there has been an increase and how this may best be checked.