LYMPHOID NATURE OF TUBERCLE. 527 



be the case, the real constituents of the granule, with 

 normal tissues of the body, you will remark the most com- 

 plete correspondence between them and the corpuscles 

 of the lymphatic glands, and this is a correspondence 

 which is neither accidental nor unimportant, for was it 

 not known even of old, that lymphatic glands have an 

 especial tendency to undergo the cheesy degeneration ? 

 Even the old writers have stated that a lymphatic consti- 

 tution disposes to processes of this kind. 



With regard to pus, I need only remind you that we 

 have been occupied during several lectures in discussing 

 the question of the possibility of diagnosing between 

 pyaemia and leucocytosis, and that we have recognized 

 in the colourless corpuscles of the blood bodies so per- 

 fectly analogous to pus-corpuscles, that some have thought 

 they saw pus when they had colourless blood-corpuscles 

 before them, whilst Addison and Zimmermann, on the 

 contrary, imagined they had found colourless blood-cor- 

 puscles when they really were looking upon pus. Both 

 have a like type of formation. It may therefore be said 

 that pus has a hamatoid form, nay, the old doctrine may 

 be revived afresh, namely, that pus is the blood of patho- 

 logy. But if one would seek a distinction, if one would 

 be able to say in individual cases what is pus and what 

 blood-corpuscles, there is no other criterion than to deter- 

 mine whether the cell arose at a spot where a colourless 

 blood-corpuscle might be expected to arise, or at one 

 where it ought not be produced. 



So, moreover, we find amongst pathological new-for- 

 mation a large category, the natural type of which is 

 epithelium JEpitheliomata, if you will. But the term 

 epithelioma, which has recently been introduced by Han- 

 nover, is completely inadmissible in the case of the par- 

 ticular kind of tumour which it was intended to designate, 

 because the epithelioma is by no means the only tumour 

 whose elements bear the character of epithelial cells. 



