532 LECTURE XX. 



more succulent, nay in many cases disappears so com- 

 pletely, that at last scarcely anything but cellular ele- 

 ments remain. This is the kind of tumour which, 

 according to my opinion, ought to be designated by the 

 old name of Sarcoma. These sarcomata are frequently, 

 indeed benignant, still they do not unfrequently recur, 

 like epithelial cancer, at their original site, whilst under 

 certain circumstances they appear secondary in the lym- 

 phatic glands, and in many cases' occur throughout the 

 whole body metastatically to such an extent, that scarcely 

 any organ is spared by them. 



In the case of all these formations, every one of which 

 corresponds more or less completely to a normal tissue, 

 investigations ought not to be conducted with a view to 

 determine whether they have a physiological type, or 

 whether they bear a specific stamp impressed upon them ; 

 our final decision depends upon the answer to the ques- 

 tion, whether they arise at a spot to which they belong, or 

 not, and whether they produce a fluid, which, when brought 

 into contact with the neighbouring parts, may there exercise 

 an unfavourable, contagious or irritative influence. 



It is with these formations as with vegetable ones. 

 The nerves and vessels have not the slightest direct influ- 

 ence. They are only of importance so far as they deter- 

 mine the greater or less abundance of supply ; they are 

 altogether unable to impel to the development of tumours, 

 to produce them or to modify them in a direct manner. 

 A pathological tumour in man forms in exactly the same 

 way that a swelling on a tree does, whether on the bark, 

 or on the surface of the trunk or a leaf, where any patho- 

 logical irritation has occurred. The gall-nut which arises 



form of connective tissue. Periosteum, perichondrium, tendons &c. all of them con- 

 sist of connective tissue, in which, however, the cells have in part become converted 

 into elastic fibres and network. In Germany indeed connective (cellular) tissue has 

 ever since the time of Treviranus (1835) been divided into formed and/orm/ess, the 

 former including tendons, fasciae, ligaments, &c. from a MS. Note by the Author. 



