126 CELL THEORIES. 



means of accounting for the development of the 

 more complex elements of tissue, as well as for 

 pathological growths. 



These omissions, however, are accounted for by 

 a note inserted by Professor Strieker in the trans- 

 lation (p. 38). Misled by Cohnheim, he had be- 

 lieved the results of Goodsir, Redfern, and Virchow 

 to be founded on incorrect investigation ; but later 

 observation of his own has convinced him that 

 he was mistaken. These are not his words, but 

 perhaps they are as clear. 



No doubt the neglected discovery of Waller, 

 again made and successfully propounded by Cohn- 

 heim, that white corpuscles pass through the walls 

 of uninjured capillary vessels into the tissues, was 

 one which upset previous notions, and might well 

 create in some minds a doubt concerning the 

 doctrine of Virchow's " Cellular Pathology." But 

 looking at the subject with the advantage of the 

 five years which have elapsed since Professor 

 Strieker wrote his article, one cannot doubt that 

 the real state of matters is simply this : that 

 amoeboid connective-tissue-corpuscles and white 

 blood-corpuscles are all one set of bodies, though 

 the first are in the tissues, and the others floating 

 free in the blood ; and they might well be termed 

 common or undifferentiated corpuscles. While 



