Abstract
The value of direct sunlight and ultra violet light in the prevention and cure of leg weakness or rickets in the growing chick and laying hen has been demonstrated by numerous investigations.1 It has also been shown that ordinary glass as found in our homes and poultry houses does not transmit the beneficial rays of sunlight.2 This has stimulated the search for materials which would allow the passage of the ultra violet rays and which might be used advantageously in place of lead glass. As a result of these efforts several new “glasses” and “glass substitutes” have appeared on the market. The former are specially prepared for the transmission of ultra violet light but their cost, at the present, makes them impractical in the poultry industry. The poultryman, consequently, turns his attention to the “glass substitutes” which he can procure more reasonably, in order that he may benefit his flock .
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