664 DISEASES OF THE SKIX. 



(3.) Dermic (cicatrix normal, or cheloid, cutaneous tiimonrs 

 (wens), multi2-)le tumours (mycosis),molluscum simplex, 

 condylomata, verruca vulgaris, verruca mollis). 



CI ROUP IT. — Heterologous JSTew Formations. 



(1.) Pseudoiolasms (lupus — comprehending macidosus, ticber- 

 culosus, liijpertropMcus, exedens, serpiginosus ; and 

 lepra — comprehending maculosa, tuberculosa, ances- 

 thetica, exidcerans). 



(2.) Neoplasms (epithelioma, carcinoma). 



Class III. — Haemorrhages, e.g., Petechicc, Vibices, 

 Ecchymosis, Furjnira. 



Class IV. — Diseases of Accessory Organs, e.g., Hair, Nails, 

 Sweat Glands. 



Class Y. — Diseases defined by Uniform Causes. 



Group I. — Parasitic diseases. 

 „ 11. — Syphilitic eruptions. 

 „ III. — Eruptions of Specific Fevers. 

 „ IV. — Scrofulodermata. 



The classification of Dr. Buchanan, containing though it does 

 many diseases of the skin which are never seen amongst the 

 lower animals, is yet that best adapted for the purposes of 

 description ; and although I have given the table in its entirety, 

 I intend to describe in the text those diseases only to which the 

 lower animals are liable. 



erythematous inflammations. 



(1.) erythema. 



Inflammation of the outer layer of the dermis, including not only 

 the slight inflammation produced by mildly irritating agents, 

 such as rubefacients, cold, stings, &c., but also spontaneous 

 inflammations depending on systemic or constitutional distur- 

 bances. Its character or expression is that of uniform redness, 

 (but the redness can only be seen in the colourless skin, such as 

 white heels of horses, and mammary glands of cows), with heal, 



