My hon. Friend is referring to a very important matter, the widening of the ground for making claims for incapacity resulting from the indirect effects of employment. The environmental effect of a man's work has a great effect on his health and must be distinguished from incapacity arising directly from his employment. It is sometimes difficult to do that. I do not wish to handicap my hon. Friend in the argument he is advancing but I would ask him to distinguish between what is caused by the direct effect of employment and the results of the indirect effect of employment.