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Updated: May 25, 2025
Their favourite food is the bark of the aspen, birch, and willow; they also eat the alder, but seldom touch any of the pine tribe unless from necessity; they are fond of the large roots of the nuphar lutea, and grow fat upon it, but it gives their flesh a strong rancid taste.
Numbers of ova die without reaching maturity, the follicular cells degenerate, and the follicle becomes filled with the cells of the theca interna, which have a resemblance to those of the true corpus luteum. These degenerate follicles have been termed spurious corpora lutea, or atretic vesicles. The interstitial cells are the remains of these atretic vesicles.
It seems obvious that the corpora lutea in evolution were a consequence of intra-uterine gestation, for they occur only in association with this condition, and it is impossible to suppose that a mutation could arise accidentally by which the ruptured follicles should produce a secretion which would cause the fertilised ova to develop within the oviducts.
If this theory is sound, it would follow that corpora lutea are not formed in cases where the ova are not retained in the oviduct during their development. The essential process in the development of these structures is the hypertrophy and, in some cases at least, multiplication of the follicular cells in the ruptured follicle.
Again, if it is the withdrawal of a hormone stimulus which changes the milk gland from growth to secretion, it cannot be the corpora lutea which are exclusively concerned even in Dasyurus, for they persist during lactation, while secretion begins shortly after parturition.
NUPHAR minima is also beautiful, but it is not common. It will form an ornament for pieces of water. NYMPHAEA alba. NYMPHAEA lutea. These are aquatics, and scarcely any plant is more deserving of our attention.
But in this case the sucking stimulus has been applied to the glands after a very short gestation, while the hormone from the foetus is being absorbed in the pouch, and therefore the hereditary correlation between secretion and absence of foetal hormone may be assumed to have been lost in the course of evolution. We have next to consider the question of the evolution of the corpora lutea.
When pregnancy does not occur the corpus luteum is formed, but begins to diminish within ten or twelve days in the human species and is then gradually absorbed. According to O'Donoghue, in the Marsupial Dasyurus there seems to be no difference either in the development of the milk glands or of the corpora lutea between the pregnant and the non-pregnant animal. Lin.
On the lower slopes, gentians or anemone plants with their buds waiting to open when the soft wind or rain of Spring calls to them. Erica carnea with its whitish buds waiting for Spring to colour them, one of the earliest of the flowers. Or the seeds of Gentiana lutea or asclepedia or purpurea and of Aconite or Monkshood on their strong stems standing high above the snow.
This root, taken internally, acts with extreme violence as an emetic, and has been observed, even in a small dose, to occasion convulsions and other terrible disorders. The ancients sometimes employed it in very obstinate cases, and always made this their last resource. Similar Plant. Gentiana lutea, which see. VERONICA Beccabunga. BROOKLIME. Herb.
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