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The external secretion of the testes differs from the internal secretion in containing spermatozoa; it may be that there are other differences. It is, however, generally believed that one or more of the substances found in the external secretion appear in the internal secretion.
There is another reason why, on the part of woman, this time should be extended, especially when she is a bride and inexperienced in these matters, and that is, that her "innocence," and all her education, make her feel that she is doing wrong, or at least permitting a wrong thing to be done, and this holds back the proper growth of her passion, hinders the tumescence of her sex organs, delays the flow of the precoital secretion, and so keeps her from becoming properly prepared for her share of the mutual act.
The alveoli contained a secretion which was almost certainly milk, O'Donoghue states that the entire series of growth changes in these animals up to twenty-one days after heat in identical with that which occurs in normally pregnant animals. Kinderh.
When the duck is driven by a hungry fox to leave her eggs, she covers them with down, in order that they may not cool during her absence, and, moreover, glues the down into a case with a secretion supplied to her by Nature for that purpose. The deserted eggs are safe, for that secretion has an odour very disagreeable to the intruder's nose.
If the foetal hormone is absorbed from the pouch, as I have suggested, in order to explain the persistence of the corpora lutea during lactation, then the secretion of milk after parturition ought not to take place.
Typically, the secretion of milk begins the third day after delivery; yet in perfectly normal patients it may appear as early as the second or as late as the fifth, and occasionally lactation does not begin until the baby is more than a week old.
Or, in lesser measure, it may completely destroy the appetite, as occurs when a disturbing emotion arises at mealtime. This is probably brought about by the checking of the gastric secretions. It may check the secretion of milk in the nursing mother, or it may change the quality of the milk so that it almost poisons the infant.
Respiration is more active during the progress of an inflammation; and bronchial catarrh is common apart from any antecedent respiratory disease. Gastro-intestinal disturbances take the form of loss of appetite, vomiting, diminished secretion of the alimentary juices, and weakening of the peristalsis of the bowel, leading to thirst, dry, furred tongue, and constipation.
For all this time the physiologist has been working. Beginning with a candle and now holding in his hands the most powerful arc-lights, he has explored two regions, the sympathetic nervous system and the glands of internal secretion, and has come upon data which in due course will render a good many of the Freudian dicta obsolete. Not that the Freudian fundamentals will be scrapped completely.
It is unnecessary to enter upon a closer explanation of the anatomical structure of these peculiar organs. A portion of the night-dew must be attributed to this secretion of water. From these considerations it necessarily appears that the hydathodes are of great biological importance to the plant.
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