A long-winded sub-title, and a bit long-winded in treatment. There is none of the light touch we have come to associate with the ""back to the farm"" books. Nothing of personal or anecdotal treatment. Merely what the sub-title indicates, a biological and scientific approach to the problem of where our future lies, what is to supply the brains and blood and tissue of a future generation, etc. The authors indicate, now from one angle, now another, that the city dweller is lowering the birth rate, the country dweller raising it, therefore it behooves the best blood of the city to get back to the country.