54 THE CONNECTIVE TISSUES, BY A ROLLETT. 



sence of migrating cells in the connective tissue ; and after he 

 had demonstrated that the cells of pus possess amoeboid cha- 

 racters similar to those which were already known to exist in 

 the white blood and lymph corpuscles, he pointed out that pus 

 corpuscles lying in this tissue as, for example, in the inflamed 

 cornea or in the mesentery of the rabbit possessed the same 

 mobility. He further found that young cells, agreeing in their 

 characters with the white blood corpuscles, are present in 

 small numbers in the healthy cornea of the eye, in the tail of 

 the tadpole, in the peritoneum, and in various other places. 



Where such cells are found in connective tissue, they are 

 characterised by their relatively rapid change of form, and by 

 their coincident and considerable changes of place in the tissue, 

 on which account they were designated migrating or wandering 

 cells* by Yon Recklinghausen. In regard to these cells, we 

 must refer to the general doctrines of cells already given, and 

 to the section on the blood. It may, however, here be remarked 

 that they may be easily differentiated from other movable cells 

 occurring in the animal body. Amongst the various cells pre- 

 sent in the connective tissue of the fully developed and adult 

 organism, these white blood-corpuscle-like cells are best charac- 

 terised by the circumstance that they alone deserve to be 

 named amoeboid cells. These cells, if the expression may be 

 allowed so, are the most active, and present the most variable 

 forms that are ever observable in this form of tissue. From 

 the researches which Strickerf made on the permeability of the 

 walls for the morphological elements of the blood, and those of 

 CohnheimJ and Hering on the exit of the white blood cor- 

 puscles through the vascular wall into the tissue, the deriva- 

 tion of the migrating cells of the connective tissue from the 

 blood has been certainly demonstrated in some particular in- 

 stances, and rendered highly probable for all. 



The migrating cells may be most conveniently observed, || 



* Wandernden Zellen. 



f Sitzungsberichte der Wiener Akademie, Bd. lii., p. 379. 

 f Loc. cit. 



SitzungslericMe, Bd. Ivi., p. 691. 



|| Von Recklinghausen, loc. cit. F. E. Schulze, Archivfiir Mikroskopische 

 Anatomie, Bd. ii., p. 378. 



