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The glands of the stomach and intestines are not yet fit to perform digestion properly, while the muscular power is too feeble for the effort at sucking. Everything is sketched out, but to nothing has the finishing touch been put, and hence the frail machinery too often breaks down, in the endeavour to discharge its functions.
Keith is also of the opinion that "the sexual differentiation, the robust manifestations of the male characters, is more emphatic in the Caucasian than in either the Mongol or Negro racial types ... in certain negro types, especially in Nilotic tribes, with their long stork-like legs, we seem to have a manifestation of abeyance in the action of the interstitial glands."
They also demonstrate that the internal secretion of the sex glands, well advertised as it has been as the Elixir of Youth that Ponce de Leon, and Brown-Séquard with so many others, pursued in vain, is not the whole story. For if it was, the duration of the new youth should be another span of life, whereas in actuality it is only a fraction of that time.
It should be remembered that sex in higher mammals is of the whole body, and depends upon all the secretions. Hence an accident to one of the other glands may upset the balance as well as one to the sex glands themselves. For example, 15% of Neugebauer's cases of female tubular partial hermaphroditism had abnormal growths in the suprarenals.
It has no blood-vessels and no nerves, but is nourished by lymph which escapes from the vessels deeper in the skin. It is simply protective in nature. The true skin is made up of two indistinct layers, which harbor a vast multitude of nerves, blood-vessels and lymph-vessels. In the skin there are two kinds of glands, the sebaceous and the sweat glands.
What is sexual about them is firstly, that they are normally fully developed only in the female, rudimentary in the male; secondly, that their periodical development and functional activity depends on the changes which take place in the ovary and uterus. Many investigators have endeavoured to discover the nature of the nexus between the latter organs and the milk glands.
It is this function of the sweat glands which makes it necessary for us to bathe the surface of our bodies with water. Dirt, in the ordinary sense of the word, is not harmful to a sound skin. Our reason for bathing is really to remove the wastes which we ourselves have poured upon the surface of the skin.
The salivary glands act imperfectly; the mouth becomes dry, and is often opened and shut. I have also noticed that under slight fear there is a strong tendency to yawn. One of the best-marked symptoms is the trembling of all the muscles of the body; and this is often first seen in the lips.
In such a cow the digestive organs are active and energetic, and they make an abundance of good blood, which in turn stimulates the activity of the nervous system, and furnishes the milky glands with the means of abundant secretion. Such a cow, when dry, readily takes on fat.
I have been led to these conclusions from examinations on the banks of the Victoria River. A flying doe, inhabiting the grass flats, of more than ordinary size, was killed. In thrusting my fingers into the pouch, I found that the mammary glands were remarkably enlarged, pressing forcibly into that cavity.
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