1. The general course of prenatal growth in the mouse, the guinea pig, and the chick can be expressed by straight line relations between the logarithms of the weight and age only when age is counted from the beginning of the embryo proper. 2. This is interpreted as showing that the manner of growth before the beginning of the embryo proper is essentially… (More)
Under usual conditions, the growth of the suckling mouse is limited by the quantity of mother's milk available. As this limitation is removed the growth curve approaches a parabola, which is abruptly interrupted at the end of the second week, when the natural process of weaning begins.