Abstract
IN A PREVIOUS paper by the authors (1937) the effect of feeding chickens a mineral deficient ration was demonstrated. It is the purpose of this experiment to demonstrate the inadvisability of attempting to fix the mineral content of the ration to obtain normal skeleton development. As our aim was to produce a normal skeleton it was presumed to be most essential that our observations be not confined to one group of birds, but to several groups. By such procedure an average picture of the normal skeletal growth would be secured, rather than a retarded or an accelerated growth, which might result from one mismanaged, or unhealthy group of birds. In view of possible differences between the skeletons of males and females of the same breed, or between the same sex of different breeds, it was considered necessary to make the following preliminary observations: (1) a radiological comparison of the males .
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