CHILDREN'S GARDENS 21 



and can only work two or three hours each day be- 

 cause of the difficulty. The risk and annoyance are 

 also very great. 



That is the sum of Speed 



Annoyance L=$2.oo per hour. 

 Danger 



When the same class of labor -1 

 . t . , , ^=$.20 per hour. 



with these elements removed 



