454 Veterinafy Medicine. 



thickening of the entire skin from exudation and cell growth, 

 from Yz inch to 2 or more inches in diameter and sometimes be- 

 coming confluent. Examples: Urticaria (surfeit) in solipeds, 

 and cattle ; petechial fever, farcy, etc. Sometimes chronic. 



5th. Vesiculae : Blisters. Rounded or conical elevations 

 the size of a millet seed to a pea, and having a small liquid exu- 

 dation under the cuticle in the centre. In inflammations of the 

 papillary layer, of a sufficiently acute type the tendency is to the 

 formation of vesicles. These lesions are, therefore, often present 

 in very different forms of skin disease from those due to simple 

 thermic irritation, to con.stitutional diseases like eczema, or con- 

 tagious ones like sheep-pox. May merge into pustules or other 

 advanced lesions. 



6th. Phlyctenae : Bullae : Blebs. In these the individual 

 lesion is larger than in vesicles. They are of any size from a pea 

 upward. The most striking example is in cantharides, blisters, 

 scalds and burns, but in other ca.ses it depends on a consti- 

 tutional condition or a specially exudative dermatitis. 



7th. Pustulae : Pustules. These differ from vesicles in that 

 the central exudate becomes the seat of suppuration and a 

 limited collection of pus, at first central, though later involving, 

 it may be the whole area of the exudate. It is often merely 

 an advanced stage of the papule or vesicle. We find examples 

 in the different forms of variola, in lesions caused by tartar 

 emetic or croton oil, and in several forms of dermatitis. It is es- 

 sentially microbian. 



8th. Furunculus : Furuncle : Boil. Inflammatory nodosity 

 of the derma, resulting in a necrotic central core and suppuration. 

 Is bacteridian and common on the coronet and lower parts of 

 the limbs in solipeds. 



9th. Carbunculus : Carbuncle. An inflanmiatory nodosity 

 or cluster of nodes of much greater extent, tending to necrotic 

 change and sloughing over a much more extending area. 

 Microbian. 



loth. Squama : Scales : Dandruff. Exudation products and 

 cells des.sicate and exfoliate as bran-like scales or thicker co- 

 herent laminae. Examples are ^ound in psoriasis, pityriasis, 

 eczema, variola, rinderpest, etc. 



nth. Crustae : Crusts: Scabs. Hard, solidified masses of 

 epidermis, blood, pus and serous exudate. 



