46 CLINICAL DIAGNOSTICS. 



Local sweating (hyperidrosis localis) , or sweat 

 appearing on only one side of the body (hemidrosis) is seen 

 at times to accompany diseases of the nervous system. 



A decrease in sweat secretion (hyphidrosis) 

 can be so well developed that the skin feels dry (anidrosis). 

 This condition can best be appreciated on the muzzle of the 

 ox, the snout of the hog, or the nose-tip of the dog. These 

 parts in healthy animals are moist and nearly cold. During 

 high fever, severe diarrhea, diabetes insipidus (polyuria), 

 hyphidrosis is a common attending symptom. In severe dis- 

 eases where life is threatened, the nose feels cold and dry. 



III. Swellings in, and immediately under, the skin. 

 Diffuse or multiple swellings appearing in or immediately 

 under the skin are of great importance as an aid to the diag- 

 nosis of internal diseases which they accompany. 



Tumefactions of the skin attend the following morbid 

 processes : 



Edema of the skin and subcutis (anasarca) 

 is an abnormal accumulation of serum in the connective tissue. 

 It is produced by a transudation of fluid (liquor sanguinis) 

 from the blood into the intercellular spaces. The lymph 

 spaces being clogged prevents the escape of the fluid. Ede- 

 matous swellings are doughy on palpation and retain finger im- 

 prints. 



Edema can be due to : 



a. Continued venous congestion, the free circulation of 

 the blood being interrupted (dropsy from stasis). In such 

 cases a dropsical swelling appears in pendent portions of the 

 body, removed from the heart. The prepuce, in front of the 

 mammae, ventrally along the abdomen and thorax, hind limbs, 

 brisket and throat are the favorite seats of these enlarge- 

 ments which are neither painful nor hot. Any morbid condi- 

 tion which interferes with the free flow of the blood through 

 the veins, leading to a stagnation in these vessels, tends always 

 to produce edematous swellings. They attend organic heart 



