20 



THE RELATIVE STRENGTH OF 



can lay no stress on this result ; the mother works 

 out part of the time in 129, and the whole time in 

 79 cases, which are more reasonable numbers on 

 which to base a conclusion. 



We must now turn to the second problem under 

 consideration, i.e. the influence of the occupation 

 of the father on the physique of his sons. Unhealthy 

 trades have been considered largely responsible for 

 physical unfitness In the children. After some con- 

 sideration we decided to measure the unhealthlness 

 of a trade by the annual deathrate per 1000 living 

 In the different trades between the ages 25 and 45. 

 These numbers were taken from the Registrar 

 General's returns for Scotland, and range from 3 per 

 thousand for ministers and gamekeepers to 18 per 

 thousand among barmen, cellarmen and general 

 labourers. The classification is not by any means 

 perfect but, though rough. It gives a fairly satis- 

 factory estimate of the healthiness or unhealthlness 

 of a trade. 



Table II. 



Low Mortality Rate of Fathers and Greater Height 

 AND Weight of Sons. 



