IN a previous paper, Tyler [1940] has shown that there is a reciprocal relationship between changes in the Ca of the Ca3(PO4)2 of bone (designated Cap) and changes in the residual Ca of bone (designated CaR) for laying birds, and also that it is the daR which is chiefly concerned with the fluctuations of bone Ga during laying. In the experiments from which these results were obtained two other birds moulted afid it is now proposed to discuss the bone changes for these two birds. The experiments were described in the preceding paper and it is only necessary to add that the bird C 1 received calcium carbonate as the calcium supplement and that the bird G 1 received calcium gluconate.
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C. Tyler (1940) studied this question.