EXTRACT XII. 



ON NEURAL EXCRETION, AS THE DETERMINING 

 FACTOR IN FASHIONING THE CHARACTER AND 

 PATTERN OF SKIN ERUPTIONS, AND ON RODENT 

 ULCER, CANCER, AND DISTURBED MATERIO- 

 DYNAMIC BALANCE. 



IN alluding to the causation and incidence of the exan- 

 themata, we advanced the opinion that they represented 

 neural excretion consequent on incubation of the microbic 

 viri or organisms in the cerebro-spinal lymph, and were 

 to be regarded as primarily diseases implicating the neural 

 rather than the haemal system. On the continuation of 

 our studies along this line, we have become convinced that 

 these views apply as well to very many of the more slowly 

 progressing cutaneous affections manifesting themselves 

 by eruption, or in other more or less conspicuous alteration 

 of the cutaneous textures and surface, and owing their 

 production to such very various morbific agencies as 

 metallic, chemical, and bacterial viri y but eventuating in 

 common in excretion through nervine channels in the 

 great external area of final disposal of effete and noxious 

 residual nervine materials. The cutaneous eruptions here 

 alluded to usually conform to the configuration of the local 

 terminal peripheral nervature, appearing in discrete or 

 confluent proportions according to whether one or more 

 terminal arborisations are involved in the work of 

 excretion, and whether one or more of the con- 

 stituent neural fibral elements of the implicated arbori- 

 sations are shedding their residual contents, and in 

 what proportions these elements are represented in the 



