. Body-build and its inheritance. Heredity; Human anatomy. ONTOGENKI K « i i;\ l. 01 m II.!>. 13 the lad is quickly transformed into a broad-shouldered, broad-chested, stocky man (plate 3, fig. 3, plate :>, I'm. 8) and accordingly the of build rises much more in the young man than in the young woman (plate 7, figs. 4 and 5). Consequently the adult female build, as measured by relative chest circumference, is relatively Bmall. At about 19 or 20 years' growth in stature has usually practically ceased. Meanwhile chest-girth increases slowly by the enlargement of trunk muscles and deposition
. Body-build and its inheritance. Heredity; Human anatomy. ONTOGENKI K « i i;\ l. 01 m II.!>. 13 the lad is quickly transformed into a broad-shouldered, broad-chested, stocky man (plate 3, fig. 3, plate :>, I'm. 8) and accordingly the of build rises much more in the young man than in the young woman (plate 7, figs. 4 and 5). Consequently the adult female build, as measured by relative chest circumference, is relatively Bmall. At about 19 or 20 years' growth in stature has usually practically ceased. Meanwhile chest-girth increases slowly by the enlargement of trunk muscles and deposition of fat. Weight i-, indeed, stated to increase, on the average, until the age of 55 years (tables G and 7). Relative chest girth. 670 660 650 640 630 620. V v7\ v \ f\ 1 \/ r I 610 I- M itha Fro. 2.—Polygon of relative chest-girth in infants, from liinli ; fourteen months, with smoothed curve of build (dotted line). Data from New York Milk Stations and I >r B. Ratner. It may be well to consider briefly, necessarily somewhat specula- tively, the significance of this ontogenetic change in build. First of all, the high relative chest circumference of infancy is due chiefly to the extremely short legs of the infant. Leg-length constitutes only about 40 per cent of stature at birth, whereas it comes t constitute 53 to 55 per cent at maturity. Consequently, the relative leg-length at infancy is only a trifle more than 70 per cent of tic adult relative. 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 Davenport, Charles Benedict, 1866-1944. Washington, Carnegie Institution of Washington
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecthumanan, bookyear1923
