asked the Minister of Health if his advisers have as yet arrived at a period between taking mass radiographs so as to give a reasonable sense of security of absence of T.B. in people so examined.

I am advised that no such period can be defined.

asked the Minister of Health how many mass radiography outfits are now at work in the country and what is the average per month of people radiographed by these outfits.

There are at present 22 units working in England and Wales. For the first six months of this year the number of persons examined averaged about 50,000 a month.