20 ORGANS OF THE SENSES TOUCH DIAGRAM 2. 



nothing else than the nerves. "We are informed by these 

 wires, of everything which acts agreeably or disagreeably on 

 the different parts of the body; and we send orders to the 

 muscles by the same wires to make the movements which we 

 desire. 



OEGANS OF THE SENSES DIAGRAM 2. 



ORGANS OF THE SENSES. There are five senses by which we 

 know what is passing around us : touch, sight, hearing, smell, and 

 taste. By touch, we ascertain if bodies are hard or soft, hot or 

 cold, rough or smooth. In the dark, touch also teaches us the 

 forms of objects. It is thus that the blind can perceive with, 

 their fingers all the objects which it is enough for us to see 

 with our eyes, to know that they are there. The skin is the 

 organ of touch, as the eye is the organ of sight. 



The eyes perceive the most distant objects, and inform us of 

 their presence, even when we cannot touch them, as the clouds 

 and stars. They also show us the colour of objects. The ear 

 hears the sounds produced by sonorous bodies. Smell informs 

 us of the odour of surrounding bodies, when we breathe through 

 the nostrils the air which has passed over them. Taste is 

 situated on the tongue and in the mouth, and the object which 

 we wish to taste must be laid directly on the tongue itself. 



Skin. The skin covers the whole 

 body, but it is not everywhere of equal 

 thickness. It is especially thin on the 

 eyelids, and especially thick on the 

 back, under the foot, and on the palm 01 

 the hand. It exhibits undulating lines 



which form elegant patterns at the end 

 Skin (highly magnified). Q ^ ^^ T ^ Q Hneg are separate 



little ridges, which we can see very well if we look with, a little 



