The blood has always been the object of intense interest to all thinking persons and especially to medical men. Of the various and complicated activities that take place in the lymph glands, the spleen and the bone marrow the most striking and apparently one of the most important is the formation of the various blood corpuscles.
Recently attention has been directed again to certain hitherto rather neglected lymph glands with distinct blood sinuses which seem to occupy intimate relationship to the other blood-forming organs. In this country, Warthin of Ann Arbor has made these hemolymph glands the subject of extensive investigations1; and simultaneously investigators in Germany and in Italy have published articles on the same topic. Warthin recognizes two structural types of lymph glands with blood sinuses, namely the splenolymph glands and the marrow-lymph glands, the former being the more numerous and related structurally and functionally to the ordinary