United States or Ethiopia ? Vote for the TOP Country of the Week !
They cast an equal eye on foes and friends and neutrals or strangers. They never injure, in thought, word, or deed, immobile things or creatures that are viviparous, or oviparous or born of filth, or called vegetables. They have no homes. They roam over hills and mountains, upon shores of rivers or seas, under shades of trees, and among temples of deities.
It has been suggested that the viviparity of the mangrove is a survival of a very remote period in the development of the earth that a mangrove swamp represents an age when the earth was enveloped in clouds and mist; and that with the gradual decrease in tepid aqueous vapour the viviparous habit, then almost universal, was lost, except in the case of this plant.
It would be interesting to know how long the rudimentary corpus luteum persists in Ornithorhynchus: the period, according to my views, should be very short. It is remarkable that in the results quoted by Marshall a well-developed corpus luteum was found and exclusively found in the lower Vertebrates which are viviparous.
The bladder also opens into the cloaca in the Monotremes, and, indeed, apart from the two urinary ducts; in all the other Mammals the latter open directly into the bladder. It was proved by Haacke and Caldwell in 1884 that the Monotremes lay large eggs like the reptiles, while all the other Mammals are viviparous.
Insects impregnated for six generations. Polypus branches like buds. Creeping roots. Viviparous flowers. Tænia, volvox. Eve from Adam's rib. Semen not a stimulus to the egg. Embryons not originally created within other embryons. Organized matter is not so minute. 2. All the parts of the embryon are not formed in the male parent. Crabs produce their legs, worms produce their heads and tails.
Each of these buds of a tree has its proper leaves or petals for lungs, produces its viviparous or its oviparous offspring in buds or seeds; has its own roots, which extending down the stem of the tree are interwoven with the roots of the other buds, and form the bark, which is the only living part of the stem, is annually renewed, and is superinduced upon the former bark, which then dies, and with its stagnated juices gradually hardening into wood forms the concentric circles, which we see in blocks of timber.
On moles, Bell, 'Hist. of British Quadrupeds, 1st ed., p. 100. On squirrels, Audubon and Bachman, Viviparous Quadrupeds of N. America, 1846, p. 269. On beavers, Mr. Livingstone speaks of the males of the many animals in Southern Africa as almost invariably shewing the scars received in former contests. The law of battle prevails with aquatic as with terrestrial mammals.
Probably in this instance nutriment is actually provided through these threads for the use of the embryo, in which case we must regard the mechanism as very closely analogous indeed to that which obtains among mammals. Some few fish, indeed, are truly viviparous; among them certain blennies and carps, in which the eggs hatch out entirely within the body of the mother.
Word Of The Day