SECRETION. 291 



result. The use of ardent spirits deranges all the secretions, 

 and this is one reason why they shorten life so much. 



Questions. What is Secretion ? Is it a vital process ? Have vege- 

 tables the same property of secretion,/? 'Illustrate this. What is the use 

 of this function ? What is the most simple form of secretion ? How 

 is it proved that secretion is a vital process ? How many kinds of se. 

 cretory organs are there What are exhalents ? their use ? What 

 is fat ? How is life supported in sickness ? What is marrow ? What 

 are the external secretions ? How much does the insensible perspira- 

 tion amount to in 24 hours ? What important inference do we derive 

 from this in relation to health ? What is use of transpiration by the 

 skin ? What is the exhalation from the lungs owing to ? What are 

 follicles ? What are the chief agents of secretion ? What are glands 

 composed of? their structure ? How are the secreted fluids divided ? 

 What becomes of useless substances carried by absorption into the 

 blood ? Can health be maintained if the secretions be checked ?/ ^-r- 



