Abstract
Last year the writers reported2 an experiment which showed that leg weakness in growing chicks is really the same as rickets in mammals and that it can be prevented in the same way that rickets can be prevented, that is by either including the anti-rachitic vitamin in the feed or by exposing the chicks to ultra-violet light either from the sun or from a mercury quartz lamp. The study of the influence of ultra-violet light on leg weakness was repeated this year with results in exact accord with those previously reported, namely, that an exposure of ten minutes to ultra-violet light from a mercury arc light or a few hours in the sun light per day prevents leg weakness in growing chicks on a diet on which similar chicks not receiving the light treatment will develop weak legs. Analyses of the blood and bone show the content of calcium and .
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