Primary or autochthonous arterial thrombosis of the large vessels, other than the aorta with sequelæ, affords a sufficient incentive to a most careful analysis of each case from a clinic as well as from a histologic standpoint, as the gravity of the subsequent conditions is of paramount importance.
The occurrence of secondary emboli from thrombosis in arteries other than the aorta and pulmonary arteries gives the following case an especial significance. To Virchow is given the credit of first actually proving anatomically and clinically, as well as of having first recognized that not all intravascular and antemortem clots are formed at the place where they are found. but are the result of emboli. It is a well-known fact that embolus with secondary thrombosis plays a greater rôle in arterial occlusion than primary thrombi, yet the close relation of the latter to the former, as in this case, accentuates the necessity