$4,500,000 DIRIGIBLE TO GIVE U.S. AIR LEAD

THE PROPOSED $4,500,000 AIRSHIP OF THE U.S. NAVY, as an artist conceives that it would look when flying with the fleet.

X-RAYS IMPERIL HEREDITY

X-ray treatments of certain types may be laying a terrible curse on the descendants of patients now receiving them. Horrible defects and malformations may be visited upon their children far beyond the scriptural third and fourth generations.

Yet the same kind of X-ray treatments can speed up a hundredfold the rate of the controlled evolutionary processes used by breeders to produce improved kinds of animals and plants.

This sensational paradox of science may be looked to for hitherto little suspected perils in the field of medicine and for revolutionary effects in agriculture, if the findings made by Prof. H.J. Muller of the University of Texas on tiny fruit flies hold true for other living things.