Proceedings of the Natural History Society of Dublin: 1859-1862, Volume 3The Society, 1863 - Natural history |
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abundant acute algæ alluded Anemone angles animal Ankistrodesmus appears Ballina Ballyvaughan Bartra basal bats bees birds Black Tern Bréb breed Burren captured cave cells characters Clare cliffs Closterium coast colour common conjugation Cosmarium crab crustacea denticulata described Desmidiaceæ differs distinct Docidium Downpatrick Dublin elliptic empty frond end lobe end view endochrome extremities fawn colour Feakle female fern fish flock former frequently frond front view genus gonidia granules hexagon inch Ireland Irish Island Killala Bay KINAHAN Lahinch Lamarck latter locality Lough Lough Conn male margin Micrasterias middle lobes migration mouth Moyview Natural History nearly observed occasionally occurred paper Pediastrum plant plumage pools portion prawn present projections Ralfs rare remarkable river rocks rotata rounded Sagartia seems seen segments shore shot side Snowy Owl Society sometimes Spanish Point species specimens sporangium summer tapering tentacles theory tion truncate uterus variety vas deferens visitant winter young zoospores
Popular passages
Page 137 - I by no means expect to convince experienced naturalists whose minds are stocked with a multitude of facts all viewed, during a long course of years, from a point of view directly opposite to mine. It is so easy to hide our ignorance under such expressions as the "plan of creation," "unity of design," &c., and to think that we give an explanation when we only re-state a fact.
Page 23 - Desmidieae,' a work which has greatly increased our knowledge of these obscure beings : " Freshwater figured, mucous, and microscopic Algt, of a green colour. Transverse division mostly complete, but in some genera incomplete. Cells or joints of two symmetrical valves, the junction always marked by the division of the endochrome, often also by a constriction. Sporangia formed by the coupling of the cells and union of their contents.
Page 140 - ... being occasionally hatched with a somewhat longer winglet, and a dwarfed stature ; on the probability of such a variety better adapting itself to the changing climate or other conditions than the old type — of such an origin of Alca...
Page 70 - ... given organism is in reality a true species. That is, it is not proved that some other form, which in the present state of knowledge we are constrained to suppose a distinct species, may not in truth be only a phase of variation, or of development, or an "alternation of generation " of the actual species, whose extremes of variation, or whose life history, are as yet unknown.
Page 129 - ... prennent constamment cette figure dans leur formation. Qu'on observe les petites écailles de la peau d'une roussette, on verra qu'elles sont hexagones, parce que chaque écaille croissant en même temps se fait obstacle et tend à occuper le plus d'espace qu'il est possible dans un...
Page 44 - A similar.process as to the transfer of the ova takes place in the fish as described in the last, with the exception that the males have no abdominal sac to enclose the ova. These fish, under favourable opportunities of calmness and of tides, may be seen side by side clinging with their tails to the tufts of Zostera marina, in which position the male is enabled to attach to the abdomen the ova, by the same influence of viscid secretion alluded to in the marsupial species.
Page 129 - On this subject I cannot do better than quote the words of Speaker Onslow, as given in one of his Notes on Burnet's History of his own Times.
Page 130 - ... toutes nécessairement hexagones par la compression réciproque. Chaque abeille cherche à occuper de même le plus d'espace possible dans un espace donné; il est donc nécessaire aussi, puisque le corps des abeilles est cylindrique , que leurs • cellules soient hexagones par la même raison des obstacles réciproques.
Page 70 - I would draw attention to a circumstance I am disposed to look upon as an almost unimpeachable argument as to their actual specific distinctness. I allude to the fact that, no matter how numerous or how few the fronds, the conjugating specimens always conjugate like form or species with like form or species — the abundant with their abundant neighbours of the same species, the rare seeking out the rare of the same species, and overlooking the possibly more numerous specimens of a perhaps closely...
Page 136 - Ce ne sont pas les organes, c'est-à-dire la nature et la forme des parties du corps d'un animal qui ont donné lieu à ses habitudes et à ses facultés particulières...