TEARS ARE OF GREAT VALUE TO THE RACE 
They may not always be appreciated by the individual, or the individual's parents, but his- 
torically, according to Dr, Crile, they act as a safety valve for the body, just as laughter 
does. When a strong emotion is felt, the blood is filled with substances intended to be 
used in muscular action. If no action follows, the blood is overloaded, and this surplus 
fuel would have to be eliminated as waste matter, at considerable expense to the system. 
But either laughing or crving will take the place, to some extent, of more violent physical 
action, and use up the ‘‘emergency ration’’ which otherwise, to speak figuratively, would 
cause indigestion, Photograph from the Nursery Studio, Washington, D. C. (Fig. 20.) 
