The number of books and essays dealing with sexual topics published during recent years is by no means small; but although some of the works in question have added considerably to our knowledge, the advance of sexual science as a whole has not been proportionate to the extent of these contributions.

The reason is that insufficient attention has been paid to special problems; and the majority of writers have either repeated what has already been said by another, in identical or equivalent words, or else they have published comprehensive treatises on the sexual life, which may, perhaps, be of interest to the laity, but do not in any way enrich our science.

Further advances in our knowledge of the sexual life can be effected only by the investigation of special problems. Such work is, indeed, laborious; but that it is also fruitful, has been clearly shown, not only in the first instance by von Krafft-Ebing, but more recently, above all, by Havelock Ellis, whose special studies have contributed more to the advance of sexual science than the work of dozens of other writers.

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