88 THE CELL DOCTRINE. 



minal matter, as the connective tissue corpuscle, but 

 may occur in all germinal matter to which the con- 

 ditions are supplied. Using epithelium by way of 

 illustration, as the result of the increased supply of 

 pabulum, the germinal matter first grows, as seen in 

 Plate, Figs. 7 and 8, then in the luxuriance of its 

 growth, even at the expense of the formed matter, 

 sends out buds or processes, which soon drop off and 

 become separate pus corpuscles. (Figs. 9 and 10.) 

 These are produced so rapidly that there is not time 

 for formed material to form upon their surface in any 

 quantity, and they have not- time, therefore, to pass 

 on into epithelium. Hence pus corpuscles are al- 

 most pure germinal matter. So soon as the process 

 ceases, in consequence of the supply of pabulum 

 being diminished, the germinal matter multiplies 

 less rapidly; opportunity is permitted for the pro- 

 duction of formed material on its periphery, and the 

 cell now passes through the different grades of epithe- 

 lium, as described on pages 80, 81, and 82. The pus 

 corpuscles are analogous to the deepest layers of 

 epithelial cells there referred to, which deep cells 

 are in fact the " mucous corpuscles," so-called, well 

 known to be morphologically identical with pus cor- 

 puscles; the former being simply the young epithe- 

 lial cell on its way to become perfect epithelium, 

 while the latter is the same also, though never al- 

 lowed to pass into the perfectly formed state. 



Again, in pneumonia, and here we note where the 

 paths of Yirchow and Beale separate more widely, 

 the so-called " exudation," or product which fills 

 up the vesicular portion of the lung, considered by 



