On the contrary, if in the mother-individual all the substances developed in, or taken into, the organism _undergo combustion in such a manner that no sugar is found in the urine, not even in the smallest quantities, then an ovum can be developed such as is required to produce a male individual. Out of its protoplasm in the course of evolution elements form themselves, whence male cells are developed, which correspond to the development of tissues and forms of the male individual. Some of the cells--viz.: those which ultimately become the elements for the continuation of the species, are planned for the male sex._ It follows from all this that the result depends to a great extent both upon the diet chosen, and upon whether it has been rightly chosen to suit the organism, whether it is possible to exert such an influence as may so support the ovum in its maturation that in its development it may form itself into a male individual. It must be observed in advance that such an influence as may be effective for the production of sex must not be applied to an already fertilized ovum, but must be applied to an ovum in development before its fertilization. Indeed, it is even of greater importance to know that the mother individual has been for a considerable period anterior to the fertilization of the ovum provided with the requisite food. Care must also be taken that _after_ conception a similar befitting diet is continued for the mother, which diet should resemble that previously provided. * * * * * Of what sort must the chosen diet be which can favor the ripening of the ovum? Always only such a diet as can so modify the process of food assimilation in the organism that no excretion even of the most minute quantity of sugar discoverable by the application of the phenylhydrazin test can be detected. The quantity of sugar is small, but what has to be taken into consideration here is not so much the amount of the sugar, as the fact that this substance is being excreted. Now, it has been proved by experience that when in an organism a symptom appears, as the evidence of disease, in the form of a considerable excretion of sugar in the urine, it is in many cases possible, by the means of fitting diet, to produce a diminution of the excretion of sugar, either bringing it down to a small amount or causing it to disappear altogether.