Investigation of the urine according to recognized methods must accompany this system of diet, and, under normal circumstances, we soon meet with the phenomenon, at which we have been aiming--that the quantity of sugar has diminished to a no longer perceptible amount. When this has been attained, it may be presumed that, by a further perseverance with the same diet, the metabolism will be so regulated that, if no pathological accident supervenes, the excretion of sugar will cease. In fact, in consequence of an alteration of diet and the taking of no excessive quantities of starch and sugar, the excretion of sugar in the urine ceases for a considerable time, and only makes its reappearance after a long interval. When, in consequence of having observed the minute normal quantity of sugar in the urine, my attention was attracted to the fact that the determination of the future sex was connected with the presence of this sugar, my endeavors were directed to exercising such an influence over its presence as might enable me to get rid of it. Experiments with the most diverse diets gave me in the case of women most remarkable results. In this way I found women, using an almost exclusively flesh diet (which was, of course, especially rich in nitrogen), whose urine showed greater quantities of sugar--according to approximate estimations--than when they used a diet of carbo-hydrates, that is, sugar, fatty substances, alcohols, etc. Others, again, showed an exactly opposite result. In many cases I did not succeed in getting rid of the normal sugar in the urine; in others it disappeared soon after the beginning of the treatment. It follows that, in every case where the question is one of so influencing the sex that a male offspring may be obtained, the very first thing to be determined is whether the normal quantity of sugar is present in the woman’s urine or not. If none can be detected after repeated and painstaking search, and if reducing substances are plentifully present, we do not require to arrange the diet, but can recommend immediate impregnation, as every probability points to a male embryo. But in all cases where the normal “urine-sugar”--if I may so call it--is present, even if only traces of it are to be found, it will then be our task, by various alterations of diet, to discover that one which seems suited to the organism in such a way that it will occasion the disappearance of every trace of the “urine-sugar.” In these experiments the remarkable phenomenon is observable, that the reducing substances which I have already mentioned, and amongst these especially the lævo-rotatory glycuronic acid compounds, show alterations in respect of quantity. * * * * *