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Such products have been exposed to natural or artificial ultraviolet light, which builds up in them the valuable antirachitic Vitamin D. Dr. Harry Steenbock of the University of Wisconsin, notably among others, developed irradiation on a scientific basis.

There was a narrow thorax showing the distinct beads of rickets; the upper and lower limbs were very short, but improved under antirachitic treatment.

The study of rickets has already progressed to the stage of calculating rickets-producing diets and the methodology is identical with that for scurvy but this phase of testing still lacks evidence of an antirachitic vitamine and in that uncertainty it is hardly worth while to elaborate these diets here.

The British diets are all based on Mellanby's contention that the "A" vitamine is the antirachitic vitamine.

Mellanby of England believes the "A" vitamine is the preventive factor in this disease but Hess's results at least suggest the possibility that the antirachitic vitamine may be separate and distinct from any of those yet named, possibly vitamine "D?"