. Chemical embryology. Embryology. 450 ON INCREASE IN SIZE [PT. Ill The lower part of the abdomen becomes more prominent towards the end of the foetal period, due chiefly to the rapid expansion of the intestines at this time. The pelvis and lower extremities do not reach their greatest relative size until early adult life, although the upper extremities have reached their maximum relative size at birth. It may also be noted that the organs lying dorsal to the body axis grow at first far more rapidly than those ventral to the body axis, for,. 20 40 60 80 100 120 140 160 180 200 220 240 260 280
. Chemical embryology. Embryology. 450 ON INCREASE IN SIZE [PT. Ill The lower part of the abdomen becomes more prominent towards the end of the foetal period, due chiefly to the rapid expansion of the intestines at this time. The pelvis and lower extremities do not reach their greatest relative size until early adult life, although the upper extremities have reached their maximum relative size at birth. It may also be noted that the organs lying dorsal to the body axis grow at first far more rapidly than those ventral to the body axis, for,. 20 40 60 80 100 120 140 160 180 200 220 240 260 280 Days Fig- 59- while in the 2nd month the former are three times the size of the latter, at birth they are equal, and in the adult the latter are six times the size of the ; Jackson's data on the growth of such organs as the suprarenal gland should also be of much service to chemical embryologists, and his paper as a whole is of great value, as it summarises the results of all the earlier workers—Welcker & Brandt; Brandt; Anderson; Lomer; Meeh; Liman; Thoma; Oppen- heimer; Collin, Lucien & Beneke; Devergie; Schmidtt and Elsasser. The general results of all the workers who have occupied themselves with the weights of foetal parts are tabulated in Table 59, which gives the point in development at which the maximum percentage of the total body-weight is reached, what that percentage is, what it becomes at birth and what eventually it is in the adult Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Needham, Joseph, 1900-. New York: The MacMillan Co.
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