[39] Landois, L., Zur Lehre von der Bluttransfusion. Leipzig, 1875.

[40] This is probably true only within the limits of exactness used in these experi­ments.

[41] Friedenthal, H., “Experimenteller Nachweis der Blutverwandtschaft.” Arch. f. Physiol., 1900, 494.

[42] Uhlenhuth, P., and Steffenhagen, K., Kolle-Wassermann, Handb. d. pathol. Mikroorg., 2nd Ed., 1913, iii., 257.

[43] Nuttall, George H. F., Blood Immunity and Blood Rela­tionship, Cambridge Univ. Press, 1904.

[44] Nuttall, Blood Immunity and Blood Rela­tionship, pp. 319 and 320.

[45] Nuttall, pp. 345 and 346.

[46] Welsh, D. A., and Chapman, H. G., Jour. Hygiene, 1910, x., 177.

[47] Magnus, W., and Friedenthal, H., Ber. d. deutsch. bot. Gesellsch., 1906, xxiv., 601.

[48] Richet, C., L’anaphylaxie. Paris, 1912.