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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Pivot of Civilization by Margaret Sanger: very small size, none of them larger than a walnut, and some--the
parathyroids--almost microscopic. Nevertheless, they are essential to
the proper maintenance of life in the body, and no less organically
related to mental and psychic development as well.
The reproductive glands, it should not be forgotten, belong to this
group, and besides their ordinary products, the germ and sperm cells
(ova and spermatozoa) form HORMONES which circulate in the blood and
effect changes in the cells of distant parts of the body. Through
these HORMONES the secondary sexual characters are produced, including
the many differences in the form and structure of the body which are
the characteristics of the sexes. Only in recent years has science
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