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rapidly regained her superior position again after the operation. Her sister (2) shows a decline in weight after 14 years of age. For (3) and (4) it may be noted that (4) 's development is fairly regular, but (3) loses weight markedly after 13 years of age, and for the remainder of her school life the weight history is a discouraging one. The former (3) matured between 13 and 14 years of age, the latter (4) at about 13 years of age. Whether the drop in the curve of growth in height for (3) is due to the anaemia, the round

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shoulders, the enlarged tonsils or the slightly delayed maturity is not clear, but the curve illustrates the growth principle previously formulated that if growth in height is retarded for a short time, there is an additional increase subsequently and the normal relative position is attained.

(3) Sitting Height. (a). Brothers. In sitting height the general course of development of the brothers (1) and (2) is the same as in the standing height, the taller having the advantage; the other brothers (3) and (4) also hold their relative positions as in height. Children of the same family may differ in the proportion of height

sitting to height standing and this would explain the overlapping of curves (2) and (3), which does not occur in the height curves.

(b). Sisters. For sitting height sisters (1) and (2) hold approximately their same relative positions as in height, the distance between the curves remaining about the same during the growth period, although (2) varies a little more than (1). The other girls show the same likeness to each other in relative height sitting as standing at the beginning, but (3) having lost her relative height

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sitting position with reference to (4), does not regain it. Is this due to round shoulders, weakness or posture? The other sisters also show, at the beginning, a parallel course of the curves for sitting height, just as for standing height. After a few years, however, (3) with a taller sitting height does not continue to grow at the same rate; her curve drops down nearer to the level of (4)'s and never rises again to the height it might have attained if growth had been uninterrupted. The cause of the interruption is not clear, but posture, round shoulders or weakness might furnish an explan

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(4) Chest Girth. (a) Brothers. For chest girth there are more fluctuations in all of the curves. This may be attributed, in part at least, to the unreliability of this measurement, due to the fact that

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the muscle tissue of the chest makes it difficult to maintain an equal degree of tautness of the tape and also the fact that the volume of air in the lungs can not be kept constant from year to year.

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