NURTURE AND NATURE 13 



other persons' sons, whether the mother worked or not. We want 

 to know the height and weight of the husbands of employed and 

 unemployed mothers before we can be sure what proportion of the 

 correlation we see between the mother's employment and son's height 

 and weight is due actually to the mother's work and what is really 

 due to the less weight and height of the fathers. We quite realize 

 that we may find low wages do not depend on the physique of a 

 workman at all, but, if they do, then some of the apparent result on 

 the child of the mother's work will probably be due to the inferior 

 physique of her husband. 



There is another point in this connection we should like to mention. 

 If employment of mothers has a bad effect on their sons, either directly 

 before birth or indirectly owing to less home care, there ought to be 

 less bad effect when the mother only works out part of the day than 

 when she works out the whole of the day ; but this is not 'the case, 

 at least it is not the case in Edinburgh in those families investigated 

 by the C.O.S. From this report we are able to divide the mothers 

 into four classes : (i) those who do no work beyond their domestic 

 duties, (2) those who work in their homes, (3) those who work out 

 part of their time, (4) those who work out the whole of their time. 



Weight of Boys at a Constant Age. 



None At home Part out 



Employment of Mothers. 



Whole out 



The diagram shows the average weight of the boys for a constant age, 

 i.e. the mean age 9-6 years. The mean weight of the boys is practically 

 identical whether the mother works out all or only part of the time. 



When the mother works "in" the weight of the boys is Iqwest, 

 but there are only 31 cases, so we can lay no stress on this result ; 



