12 ' THE TONER LECTURES. 



heiten, Yirchow's Arcliiv, Band xl., l8Cu) has affirmed his 

 belief that the tunica intima takes an active if not the sole 

 part in the organization of the tlirombns. 



Thiersch (Chir. von Pitha und Billroth) would be named 

 among those who, a priori, incline to the view that the epithe- 

 lial cells and the nuclei of the different lamellse of the intima 

 sliould be considered as formative elements, active in the organi- 

 zation of thrombi. 



Henry Lee and Lionel S. Beale(On the repair of arteries and 

 veins after injury. Med, Chir. Trans., vol. i., 18G7) stvidied the 

 phenomena following a puncturing wound of an arterj', and 

 foimd that a colorless fibrin-like material fills the wound. It 

 consists mainly of colorless blood-corpuscles derived from the 

 blood in the lumen of the wounded vessel. This forms layer 

 after layer, a temporary tissue. The subsequent changes 

 which take place in this fibrin-like material, and effect the 

 permanent closure of the wound, they did not investigate ; 

 but they were convinced, a priori, that the formation of a new 

 })ermanent fibrous tissue results from the masses of germinal 

 matter (colorless corpuscles) of the temporary adventitious tis- 

 sue above mentioned, and not from the masses of "germinal 

 matter" of the arterial tunics, or of the vasa vasorum. 



Hewson (Pennsylvania Hospital Reports, vol. i., 1868) made 

 a careful study of several specimens from human arteries after 

 acupressure had been performed. Longitudinal section of the 

 acupressed vessel showed the opposite surfaces of internal 

 coat glued together by l}- mph. No clot beyond tlie point of 

 pressure, and no laceration of the internal coat. What struck 

 most forcibly was the extent of the exudation which had taken 

 place upon the internal coat, and even outside of it. The 

 thickening extended nearl3- a half inch above, gradually di- 

 minishing up to the first branch. 



Tschausoff (Ueber den Thrombus bei der Ligatur, in dera 

 "Yerein russicher Naturforscher" vorgelesen, ProtokoU des 



