Abstract
The results of serial detns. of the cephalin-cholesterol flocculation and thymol turbidity tests in patients during the incubation period and course of disease of experimentally induced infectious hepatitis are presented. Although both tests were equally positive in the active phase of disease, the cephalin-cholesterol flocculation became positive earlier than the thymol turbidity test, and also returned to normal before the latter test. The disagreement in positivity between the two tests early in the pre-icteric phase and late in the convalescent phase lends support to the concept that their mechanisms may be different.