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FREDERICK F. TISDALL, M.D. (TOR.); ALAN BROWN, M.B. (TOR.)

Am J Dis Child. 1927;34(5):742-752.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

At least three special glasses are on the market at present, which, according to the claims of the manufacturers, will transmit the antirachitic rays of sunshine. These glasses are: (1) Vitaglass—manufactured in England and marketed in the United States by the Vitaglass Corporation, New York; (2) Vioray glass—marketed in Canada by W. E. Phillips Company, Oshawa, Ontario, and (3) Corning special glass—manufactured by the Corning Glass Works, Corning, N. Y. Vioray and Corning glass have been available for only a short time.

In February, 1927, we reported that "Rays from December sunlight which had passed through Vitaglass had an antirachitic effect which was roughly one-fourth the value of the direct rays. Rays which had passed through ordinary glass had no antirachitic effect."¹ Subsequently, in a report on window substitutes approved by the Council on Physical Therapy of the American Medical Association,² it was shown that the sun's rays . . . [Full Text PDF of this Article]

Author Affiliations
TORONTO

From the Laboratories of the Sub-Department of Paediatrics, University of Toronto, and the Hospital for Sick Children.

Footnotes
Received for publication, Sept. 9, 1927.

This work was aided by a grant from the Department of Health of the Province of Ontario.

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