130 CELL THEORIES. 
be raised against him than against another who 
should maintain that the migrating cells are epi- 
thelia. Recklinghausen has advanced a theory 
respecting the conjugation of cells, which, however, 
on account of its brevity, scarcely allows us to 
judge of its value.” The theory of Recklinghausen 
refers to conjugation between different elements of 
blood. 
The part taken by Dr. Beale in the advance 
of the cell conception has been one of great im- 
portance, and is worthy of full consideration. The 
great merit of Dr. Beale appears to me to lie in 
pointing out that the cell-wall is in all instances an 
after-growth, and that the vital processes of the 
corpuscle are independent of it. In saying this, 
I am not forgetful of the work of Max Schultze 
in 1863, quoted by Stricker; but Dr. Beale has the 
priority, and lays down the doctrine of the non- 
vital character of the cell-wall in a very clear and 
emphatic manner, classifying, as was not done 
before, cell-walls with the inter-corpuscular sub- 
stance. He simplified thereby the conception of 
cell multiplication; for if the cell-wall be, even 
when present, no part of the vital corpuscle, there 
is no radical distinction between fissiparous and 
endogenous reproduction. His distinct recognition 
also that the origin of inter-communicating pro- 
