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 Stricker 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 
Stricker wrote his article, one cannot doubt that 
the real state of matters is simply this :—that 
amceboid 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 
