. Biology and man. Biology; Human beings. 72 — 68 — 64 — 60-t B 10 15 20 23 1 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 VARIATION IN STATURE When 100 boys of the same age stood in a row in the order of height, the tops of their heads formed a line like this row of dots. The middle part of the line was nearly horizontal; that is, there were several boys of almost exactly the same height have fine, silky hair; the hair of others is coarse. The hair of some is straight; that of others is wavy, curly or kinky. Rarely do we find two indi- viduals with exactly "the same kind" of nose o
. Biology and man. Biology; Human beings. 72 — 68 — 64 — 60-t B 10 15 20 23 1 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 VARIATION IN STATURE When 100 boys of the same age stood in a row in the order of height, the tops of their heads formed a line like this row of dots. The middle part of the line was nearly horizontal; that is, there were several boys of almost exactly the same height have fine, silky hair; the hair of others is coarse. The hair of some is straight; that of others is wavy, curly or kinky. Rarely do we find two indi- viduals with exactly "the same kind" of nose or mouth or ears or chin or cheeks or lips. Chemical Differences Skin-colors distinguish the large groups we call "races"—Caucasian, Mongolian, Negro, redskin, and so on. Color differ- ences usually indicate chemical differences. There are, in fact, several dis- tinct pigments in the human skin, hair and iris, and in corresponding parts of other animals. And these pigments are present in varying proportions. Even within any one "race" there are wide variations in the colorings, as well as in the intensity of pigmentation. A person who has had the measles is usually unable to get that disease again: he is said to be immune. This change does not show in one's appear- ance, but is due apparently to some chemical alteration in the blood or in other juices of the body. People differ also in their original immunity, or resistance to disease. Thus, when two individuals are exposed to typhoid fever, one may remain unaffected while the other gets sick. On the other hand, one who is immune to typhoid may succumb to tuberculosis. Such facts indicate chemical differences among people. Each of us knows some individual who suffers from asthma or hay. 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 work
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Keywords: ., book, bookcentury1900, booksubjectbiology, booksubjecthumanbeings
