The woman was kept in this condition four weeks. In the meantime menstruation took place. It lasted four days, during which time no change appeared in the analysis. An analysis was made every week. Another menstruation occurred, lasting four days, and impregnation took place six days later. After this the menses ceased. As I mentioned above, the sex of the embryo is already determined in the third month of pregnancy, for which reason I kept the patient under dietary influence up to that time. In the interim I made ten analyses at short intervals, the average results of which I shall now give. AVERAGE of TEN ANALYSES. _Reaction_: Acid. _Specific gravity_: 1028-1032. _Quantity in 24 hours_: 750 cubic centimetres, to 1200. _Color_: Golden yellow, always dark. _Sugar_: None could ever be detected. _Phenylhydrazin test_: Positive (owing to the presence of glycuronic acid compounds; melting-point of crystals 105° cent. to 120°). _Optical rotation_: 0.2-0.3 per cent. lævo-rotatory. _Reducing substances_: 0.29-0.35 per cent. _Nitrogen_: 17.9 grammes to 22 grammes (Correction 1 gramme). _Nitrogen as albumen_: 111.8-137.5 grammes. When after 5 analyses the nitrogen (expressed as albumen) had reached its highest point, it fell suddenly. Some immediate experiments proved that it was necessary to give more carbo-hydrates and less albuminous food, in order to re-establish the previous relations. The woman was subsequently allowed to follow whatever course she preferred, and bore a fine boy at full term. The task still remains of examining many facts and theories already known which may apparently be contradictory to our teaching.