216 PHYSIC 



mations was, therefore, due, secondarily, to the progress 

 of the outflowing fluid along the lines of least resistance 

 leading from the tumour, and were owing to the sustained 

 flow of that fluid, a circumstance which, moreover, explains 

 the stoppage of the growth of the tumour and the cessation 

 of the evolution of head symptoms. The other local 

 visceral involvements seem to us due to the distribution 

 by the pneumo-gastric nerves to the pulmonary and 

 hepatic structures respectively, and not to distribution by 

 the blood circulation, which, we would suppose, had not 

 been called upon at all to distribute the etiological material 

 agencies to any of the parts affected. 



We must now, therefore, recognise the great fact that 

 a third vasculature, viz. the nervine, has to be added to 

 the two mentioned by Sir W. R. Cowers, viz. the blood 

 and lymph, and that it, in fact, seems the most prolific in 

 the conveyance of disease-producing materials, the great 

 cause of metastatic phenomena, and the medium by which 

 much of the mystery involved in such occurrences can 

 find a clear and scientific explanation, because an explana- 

 tion founded on anatomical and histological truths, and, 

 therefore, absolutely consistent and decipherable. 



It is thus most interesting and instructive to observe 

 that that chameleon-like disease, syphilis, manifests its 

 symptoms not haphazard, but strictly in accordance with 

 structural anatomy, and that an explanation can be afforded 

 of such contradictory external manifestations of it as 

 appear on the skin, on the one hand, and the muscles and 

 bones, on the other, these being the structural areas to 

 which the sensory and the motor systemic terminal nerva- 

 tures are respectively distributed, and where the ' ' shape 

 and form" of the secondary and tertiary morbid phenomena 

 are respectively determined. 



