ByJ. G. HUMBLE, M.R.C.S., L.R.C.P. T HE OCCURRENCE of petechial hemorrhages in the skin and mucous membranes is a well known sign in many hemorrhagic diseases and in other complaints. Little is known, however, of the mechanism by which they are produced or the exact segment of the vessel or vessels at fault. Histologic preparations show merely an exudation of red cells, sometimes of polymorphon...