12 THE RELATIVE STRENGTH OF 



height, weight, general health and intelligence of the 

 children. 



(4) The influence of overcrowding, bad eco- 

 nomic condition of the home, moral and physical 

 condition of the parents on the intelligence, eyesight, 

 glands, and hearing of the children. 



In our investigation of the first and third points 

 we are fortunate enough to possess two distinct sets 

 of statistics in each case, so I feel I can speak with 

 greater confidence of the results. 



In the other two cases we are dependent on one 

 set of statistics in each case, for the influence of the 

 occupation of the father we have the Glasgow School 

 Board statistics, and for the effect of environment 

 on intelligence, eyesight, &c. we have the Report 

 of the Edinburgh C.O.S. 



I am glad to say that during the last few 

 weeks a fresh set of statistics dealing with Edin- 

 burgh children has been lent to the Laboratory 

 by Dr Leslie Mackenzie, which contains much of 

 interest, and a further set of schedules from Professor 

 Matthew Hay dealing with Aberdeen children. 



First I will examine the results we have found 

 for the correlation between the employment of 

 mothers and the height and weight of their sons; 

 and I would ask you to keep in mind our problem, 

 namely, are the physical and mental characters 

 of children correlated with their or their parents' 

 environment to a higher, an equal, or a lesser extent 

 than they are correlated with their parents' physical 

 and mental characters ? 



The larger series of statistics from Glasgow is 



