Blood. Studies on blood and blood parasites: 1, Observations on mammalian blood with dark-field illumination [with bibliography], 2, Priority of Cryptobia Leidy, 1846, over Trypanoplasma Laveran and Mesnil, 1901 [with bibliography], 3, Trypanosoma americanum n. sp., trypanosome which appears in cultures made from blood of American cattle, preliminary notice [with bibliography]; by Howard Crawley.