Zoologist: A Monthly Journal of Natural History, Volume 12

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West, Newman, 1854 - Natural history

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Page 4490 - ... whole is attained by the constant development of new cells. During this time, the yellow vitellus-looking mass, situated at one of the poles of the embryo, has not changed its place ; it has increased somewhat in size, but otherwise appears the same. When the development has proceeded somewhat further, and the embryo is pretty well formed, the arches of the segments, which have hitherto remained gapingly open, appear to close together on the back, thereby enclosing this vitellus-looking mass...
Page 4449 - France,' 2me Serie, tome x. 1852, and 3me Serie, tome i. 1853 ; by the Society. ' Memoires de la Societe de Physique et d'Histoire Naturelle de Geneve,
Page 4405 - Manual of Natural History for the Use of Travellers ; being a Description of the Families of the Animal and Vegetable Kingdoms, with Remarks on the Practical Study of Geology and Meteorology. To which are appended Directions for Collecting and Preserving.
Page 4479 - Donations. The following donations were announced, and thanks ordered to be given to the donors: — ' Papers and Proceedings of the Royal Society of Van Diemen's Land, Vol.
Page 4492 - ... of an inch in length, or more than eight times the size of the germ at the time when the first traces of development were seen. From this it is evident that, even admitting that these germ-masses are true eggs, the conditions of development are quite different from those of the truly viviparous animals ; such as, for instance, in Musca, Anthomyia, Sarcophaga, Tachina, Dexia...
Page 4208 - S in i ih also has lately found it in the Isle of Wight. " I regret that I could not, from the hardness of the foot-path and for want of a proper instrument, investigate the burrows, apparently formed by these bees, and I am quite unacquainted with their metamorphoses.'' The Secretary read the following extract from a letter addressed to him by Mr. T. J. Stevens of Bogota : — " Respecting small Lepidoptera, there are a great many in this hot country, at least nocturnal ones, for as soon as the...
Page 4378 - ... low bushes. Opposite each of these valleys there is a projecting flat piece of ground, consisting of the materials that have been washed down the ravine, where the only good landing for boats is afforded. The soil of the cliffs is a...
Page 4174 - ... themselves on their sides, again come together, and rubbing against each other, both shed their spawn into the furrow at the same time. This process is not completed at once; it requires from eight to twelve days for them to lay all their spawn, and when they have done they betake themselves to the pools to recruit themselves.
Page 4444 - All places that the eye of heaven visits Are to a wise man ports and happy havens. Teach thy necessity to reason thus ; There is no virtue like necessity.
Page 4500 - Aphides cannot be said to constitute as many true generations any more than the different branches of a tree can be said to constitute as many trees; on the other hand, the whole suite from the first to the last constitute but a single true generation.

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