HOUSE, GARDEN, AND FIELD 



pad ; the fourth, which should come between the thumb 

 and the forefinger, has disappeared ; and there is a little 

 pad between the little finger and the wrist. 



If you examine with a lens the ridges of the palm, you 

 will see a row of pores running along every one (Fig. 8). 

 What are these pores ? Now and then, when we are 

 heated by exercise, drops of watery fluid can be seen to 

 exude from them, and a thin section of the finger-ball 



FIG. 7. Patterns 

 of finger - tips (side- 

 view). 



FIG. 8. Ridges and 

 sweat-pores of finger-tip, 

 magnified. 



shows fine tubes coming up to the pores from coiled sweat- 

 glands, which are deeply sunk in the derm. The pores 

 are the outlets of the sweat-ducts. 



Different parts of the skin are not equally sensitive to 

 touch. Try, by stroking with a fine water-colour brush, 

 whether the tip of the finger or the knuckle most easily 

 perceives the lightest possible touch. You can distin- 

 guish, without the help of the eye, sheets of paper of 

 slightly different degrees of roughness by stroking them 

 with the finger-tip, but if you try with the knuckle, you 

 will not succeed so well. The greater or less acuteness 

 of the sense of touch in different parts of the hand may 



