362 



A YEAR IN T SCIENCE 



ness of the scalp. The falling out of hair is usually 

 due to a lack of nourishment at its root. If the bulbs 

 of the hair are dead, no substance will make it grow. 



Fat Cells 

 Fig. 169. A section of the skin highly magnified. 



Therefore, no attention should be paid to the adver- 

 tisements of hair tonics claiming that they will make 

 hair grow on bald heads. Hair may be invigorated by 

 massaging the scalp daily, but .aside from that, its 

 growth cannot be increased by any home remedies. 



Fright, anxiety, or great care may turn the hair 

 gray in a very short time, but usually the color dis- 



