THE SUMMERING OF HUNTERS. 115 



tissues, because the master tissues move the matter, 

 and the servant tissues supply them with nourish- 

 ment, and support them in their task. The master 

 tissues are three : — 



1. Bones 



2. Muscles 



3. Nerves ; 



whilst the servant tissues are very numerous, and 

 may be briefly stated to be all the parts of that 

 complex apparatus which produces, maintains and 

 keeps pure the blood. For example, and speaking 

 widely, as here we can only do, to produce the 

 blood, seeing that it is converted food, we must 

 have a converting apparatus — lips to take it into 

 the mouth ; teeth to grind it ; saliva to soften it, &c. ; 

 a set of actions to swallow it ; a receptacle — the 

 stomach — in which it can be turned over, kneaded 

 and further mixed with fluid ; a set of actions carry- 

 ing it into the intestines whence that part of it 

 which is fit is taken by a set of carrying vessels 

 from the intestines into the blood stream. This 

 blood stream in order to nourish the master tissues 

 has to be kept well supplied with drains principally 

 four— viz. the kidneys, the skin, the lungs, and the 

 bowels. These drains must always be open and 

 properly " trapped." Let the blood stream get too 

 full, the kidneys drain off a good deal of its watery 

 bulk if it is cold weather, whilst the skin will do so 

 in hot weather ; let the blood stream get impure by 

 noxious gases, the lungs will be the draiu through 



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