A controversy has long existed as to the manner in which trichina embryos are distributed after leaving the intestine, some writers contending that they migrate chiefly through the lymph spaces; others that they are distributed by the blood stream. In an experimental study in 1894, Graham observed the embryos in the arteries of rats and in hemorrhagic lesions in the lungs, and Stäubli,1 in 1905, by a special method succeeded in finding them in the heart's blood of infected guinea-pigs and more recently in the blood from the ear of these animals. His method consisted in laking the blood with 3 per cent, acetic acid, centrifugating and examining the sediment. At that time he predicted the use of this method for finding trichina in the blood in human cases for diagnostic purposes, but reported no cases.
Recently Herrick and Janeway,2 using Stäubli's method, have fulfilled his prediction, finding