1. Rabbits were immunized repeatedly with the protein urin of pregnant toxikosis (pregnant edema, pregnant nephrosis, preeclampsia, eclampsia), inflammation of kidney and nephrosis. As the result of this experiment above, rabbits had antiserum with high precipitin titels. 2. Rabbits which were immunized repeatedly (ten times) with the protein urin of pregnant edema, pregnant nephrosis and inflammation of kidney could easily get antiserum with high precipitin titels but only few precipitin quantities, and showed no heterogitis. On the other side rabbits which were immunized repeatedly (ten times) with the protein urin of preeclampsia, eclampsia and nephrosis could easily get antiserum with high precipitin titels with the increase of the precipitin quantity, this time and show slightly higher heterogitis. Consequently, it was found that race-speciality is more intensive in the former than in the latter. 3. It was assumed from the data of the author and of other members in our department that if pregnant toxikosis turn to preeclampsia or eclampsia by getting worse, evacuation of a part of specific protein which had not been found before was found in adult serum.