In the pathologic laboratories of Bellevue Hospital, I have recently studied a primary tumor of the prostate with the characteristic structure of a lymphosarcoma. With the exception of an almost identical growth recorded by Coupland,1 I have been unable to find an acceptable description of another primary lymphosarcoma of the prostate in the literature. However, these two cases are so clearly defined that they remove all doubt as to the possibility of lymphocytic tumors' arising in the prostate. It remains to be shown by future investigation just how common such tumors are. I suspect that they are not so rare as the literature would indicate, and, indeed, I believe that lymphosarcoma should always be considered a possibility in patients under 35 years of age with prostatic tumors. The recognition of this type of growth in the prostate is peculiarly important in view of the favorable results that have been