58 Veterinarg Elements. 



C. The Sweat. The importance of the sweat glands 

 and the sweat as an avenue for the exit of waste matter 

 varies in the different animals. The sweat, and we may 

 as well include the sebaceous glands, , are appendages of 

 the skin. The sweat glands consist of coiled tubes im- 

 bedded in the skin with an outlet at the surface (pores) ; 

 the sebaceous glands are also found in the skin at parts 

 most exposed to friction, they discharge a fatty substance 

 into the hair follicles. The sebaceous secretion is most 

 abundant on the parts covered with hair or wool. The 

 yolk (oil) in sheep's wool is the product of the sebaceous 

 glands; it consists of the broken down cells of the gland 

 and gives the oily appearance to the fleece. Ill health 

 causes changes in the yolk, which are at once evident to 

 the shepherd. This oiliness can be got in the coats of 

 horses and cattle by good feeding and grooming. In 

 certain breeds of cattle this secretion is very yellow in 

 color and is much desired, as it is considered an indica- 

 tion of the tendency to secrete rich milk ("?), the inside of 

 the ears are in cattle generally given a cursory glance to 

 determine this fact. In sheep a pink condition of the 

 skin is desired, a dead white or blue color indicating ill 

 health. 



Sweat glands are highly developed in man and the 

 horse, in the latter especially on the inside of the thighs, 

 as also in sheep, in cattle little sweating is done. Car- 

 nivora (dogs and cats) sweat through the soles of their 

 feet. The amount of sweat is modified by the food, 

 drink, condition of the atmosphere and amount of exer- 

 cise. Perspiration (sweat) is spoken of as sensible or 

 insensible, in the former is visible; in normal conditions 



