246 Evolution and Adaptation 
out of all proportion to what we should expect on the theory. 
And is it not a little odd that the end of the nose should be 
so highly sensitive ? 
There is another point that we cannot afford to neglect in 
this connection. It is known that in addition to touch-spots 
there are warm and cold spots in the skin, which produce, 
when touched, the sensation of warmth, or of cold, respec- 
tively, and not the sensation of touch. The degree of 
sensitiveness of different regions of the body throws an 
interesting side-light on Spencer's argument. 
The warm spots are much fewer than the cold spots. The 
spots are arranged in short lines radiating from centres 
which coincide with hairs. The number of these spots 
varies a good deal, even in the same region of the skin. If 
the sensitiveness of the skin is tested, the following results 
will be obtained. The list includes twelve grades of sensitive- 
ness, beginning with the places giving the lowest maximum 
of intensity. About one hundred square areas were tested 
in each region. 
COLD SENSATIONS 
Tips of fingers and toes, malleoli, ankle. 
Other parts of digits, tip of nose, olecranon. 
Glabella, chin, palm, gums. 
Occiput, patella, wrist. 
Clavicle, neck, forehead, tongue. 
Buttocks, upper eyelid. 
Lower eyelid, popliteal space, sole, cheek. 
Inner aspect of thigh, arm above elbow. 
9. The intercostal spaces along axillary line. 
1o. Mammary areola. 
11. Nipple, flank. 
12. Certain areas of the loins and abdomen. 
Sr aARaR YS om 
WARMTH SENSATIONS 
o. Lower gum, mucosa of cheek, cornea. 
1. Tips of fingers and toes, cavity of mouth, conjunctiva, and 
patella. ” 
