ABSORPTION. 191 



3. The second variety have two or more branches leading into 

 a common duct, as in Brunner's glands. 



4. Where a number of the third variety open into a common 

 duct, the compound racemose glands, as the salivary and pan- 

 creatic ghnds. 



5. Tubular glands composed of a number of elongated tubes, 

 as in the testicle and kidney. 



6. The ductless glands, as the spleen and supra-renal capsules. 



7. Unclassified glands, as the liver. 



The Permanent fluids are the aqueous d^ndi vitreous humors of the 

 eye, synovial, serous, cerebrospinal and fluid of the internal ear. 



The Transitory fluids are mucus, cerumen, sebaceous matter, 

 Meibomian, tears, milk and all the digestive fluids. 



The Excretiofis are the urine, sweat, fceces, and bile, which is 

 also a secretion in part. 



THE PERSPIRATION. 



(For anatomy of skin, see Sense of Touch.) 



The perspiration is of low specific gravity, about 1004, alkaline 

 or neutral in reaction, and contains about 2 per cent, of sohds, 

 consisting of urea, fats, cholesterin and salts. Its amount varies 

 with exercise and in different parts of the body, being most abun- 

 dant in the inguinal region. When it is secreted in small amounts 

 not to be seen by the eye it is called insensible; when in large 

 amounts, sensible persjnration. 



\\.'s> fu7ictions are the regulation of animal heat and also excre- 

 tion of urea, etc. 



Section of the cervical sympathetic increases the secretion in 

 that part, and certain drugs, as Jaborandi, have a like action. 



The Sabaceous matter of the skin consists of about Yi water 

 and Yi solids, of albumin, epithelium, fat, soaps and salts. 



It acts as a lubricant to the skin and hair. 



THE MAMMARY SECRETION. 



Milk is secreted soon after the birth of the foal, obtained by 

 suction, is alkaline in reaction and of a specific gravity of about 

 1030. It consists of (Charles, from Gorup-Besanez) : 



Water 82.84 



Solids 17.16 



