118 CELL THEORIES. 
bring masses of albuminoid matter into view not 
only by outline but throughout their extent, the 
general existence of such masses in bodies of the 
sort which had been known as cells came to be 
recognized, and, as a natural consequence, it gradu- 
ally dawned on the minds of independent observers 
that the outlines of such masses were the things 
which, in many instances, had been translated 
as cell-walls. 
Two other advances aided in completing a 
revolution of opinion with regard to cell-walls, 
namely, the discovery of corpuscles undergoing 
amoeboid changes of form and migrations, and the 
tracing of nerves in many instances into continuity 
with nucleated corpuscles. Thus a change has 
crept into the whole conception of the nature of 
those vital units whose importance functionally 
had been first recognized in the case of some which 
had apparently a cellular form ; and thus it hap- 
pens that the term cell is still employed in many 
instances in which it would be better to use the 
word corpuscle. A nucleated corpuscle is as con- 
venient an expression as a nucleated cell; a 
connective-tissue-corpuscle is an expression which 
involves no theory or description either of structure 
or function ; and it would be an enormous advant- 
age to the spread of accurate ideas if the word cell 
