SPECIFIC INFLAilMATORY LESIONS OF THE SKIX. 739 



the first of these we place the specific dermal exudations, the 

 purely local hypememic or erythematous appearances, the non- 

 contagious dermatoses, and probably the herpic. 



A. SPECIFIC INFLAMMATORY LESIONS OF THE SKIN. 



Under this group of the inflammatory class are included 

 the eruptions of the acute contagious dermatoses or specific 

 fevers. 



To the febrile manifestations of these, including their atten- 

 dant local phenomena, the term Exanthemata has been 

 applied ; by this is intended to be conveyed the idea of a 

 morbid process which attacks the whole system, attended 

 Avith febrile symptoms hastening through a certain determinate 

 acute course, having certain appearances and conditions 

 attached to the cutaneous surface, which local conditions de- 

 velop a specific contagious principle. 



These exanthemata possess certain common features by 

 which they may be recognised — (1) They are all preceded by 

 a fever of a variable duration ; (2) The skin appearances when 

 developed show themselves in a regular order and sequence ; 



(3) These skin changes have a definite period of existence ; 



(4) The sympathy of the system with the skin appearances is 

 indicated by certain symptoms seen during the existence of 

 the local lesions and after tlieir decline ; (5) These diseases, as 

 a rule, only attack animals once during their life. 



As these skin developments and phenomena are not truly 

 local diseases, and as they have been noticed elsewhere, nothing 

 further will be said of them here. 



B. LOCAL CONGESTIVE AND INFLAMMATORY OR ERYTHEISIATOUS 

 DISEASES. 



Under this subdivision it is desired to place those local 

 dermal disturbances and lesions associated with or attendant 

 upon hypememic or congestive action, active or passive, with 

 simple serous effusion, and which ordinarily exhibit little 

 abnormal activity in the tissue-elements outside the vessels, 

 with the production of new material or so-called inflammatory 

 exudation. Those diseased conditions, the acute non-contagious 

 dermatites of an idiopathic character, might be classed here, 



47—2 



