1) The authors recognize that Menkin\u27s leukotaxine theory is true. 2) The essential character of leukotaxine, however, must be studied in future. 3) It is not difficult to suppose that increased capillary permeability and leukocytic migration are not only sustained with leukotaxine but also with turpentine, aleuronat and extract of organs. (Yasuhira). 4) The authors wish to point out that there are many important problems in future about the relationship between rabbit serum injected with typhoid vaccine, some kinds of human serum from healthy bodies, leukocytosis-promoting factor, reciprocally
