Change with Age in Hemopoetic Organs in Mice.

No data on the features of hemopoietic organs of mice with age were found in the literature available to us. Detailed information exists only on quantitative and qualitative composition of blood under nornal Klinenberger and Carl, 1927 Downey, 1938 Kock, 1931 Hoffman, l956 and under pathological conditions Furth and Strumia, 1931 as well as papers on cellualr composition of their bone marrow Jaffe, 1931 P.P. Sakharov, 1952. A knowledge of the formation of hemopoietic organs is important as a control in a number of investigations concerning mice, especially i the study of questions concerning disease of hemopoietic organs, especially leucosis and the pre-leucosis state. In this investigation the morphological features of hempoiesis in mice were studied for different growth periods.