Annals & Magazine of Natural HistoryTaylor & Francis, Limited, 1890 |
Inhalt
| 1 | |
| 23 | |
| 34 | |
| 40 | |
| 60 | |
| 91 | |
| 98 | |
| 107 | |
| 277 | |
| 289 | |
| 295 | |
| 311 | |
| 317 | |
| 324 | |
| 342 | |
| 350 | |
| 113 | |
| 120 | |
| 121 | |
| 124 | |
| 124 | |
| 139 | |
| 146 | |
| 168 | |
| 174 | |
| 185 | |
| 193 | |
| 196 | |
| 197 | |
| 198 | |
| 222 | |
| 236 | |
| 244 | |
| 261 | |
| 275 | |
| 276 | |
| 352 | |
| 374 | |
| 380 | |
| 390 | |
| 409 | |
| 417 | |
| 423 | |
| 425 | |
| 443 | |
| 458 | |
| 466 | |
| 472 | |
| 479 | |
| 486 | |
| 494 | |
| 503 | |
| 505 | |
Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
Achatina allied Amalia anal anal fin angle Annelids antennæ apertura apex apical appears bands basal base belonging body border British Museum brown cæca calices caudal cavity cell collection colour columella costa Crinoids Dana depth described diam diameter distinct divergence dorsal fin elytra Entomis fath fathoms female fishes fore wing G. O. Sars genera genus gill-opening head hind margin Hist horny sponges inch Jeffreys Journ kalymocytes larvæ lateral line length leviter Limacella Longit longitudinal lower M'Intosh Macclesfield Bank Madrepora male Mamboia maxilla median middle millim Müller narrow nearly Nemertines nervure oblique pectoral plates portion Posterior wings prothorax punctures Pyrosoma radial rays rows septa serratostriata shell side slightly snout species specimens spines sponges spots surface suture teeth Testa Tizard Bank transverse underside upper ventral vertical W. T. BLANFORD Zooph
Beliebte Passagen
Seite 126 - Nature, pp. 130, 213. but must be rather injurious than beneficial in the bird's ordinary life. The fact that they have been developed to so great an extent in a few species is an indication of such perfect adaptation to the conditions of existence, such complete success in the battle for life, that there is, in the adult male at all events, a surplus of strength, vitality, and growth-power which is able to expend itself in this way without injury.
Seite 132 - Natural selection is, in some probable cases at all events, able to accumulate variations in infertility between incipient species " (p. 174); but his reasoning does not seem to me conclusive. Even if we grant that the increase of this character occurs by the steps which he describes, it is not a process of accumulation by natural selection. In order to be a means of cumulative modification of varieties, races or species, selection, whether artificial or adaptational, must preserve certain forms...
Seite ix - The Annals and Magazine of Natural History, including Zoology, Botany and Geology ; by Sir W.
Seite 123 - Буев of Arthropods.— Studies from the Biological Laboratory of Johns Hopkins University, Vol. IV, No. 6, contains a paper " On the Morphology of the Compound Eyes of Arthropods " by Mr. Sho Watase, which is of interest owing to its bearing on the origin of the compound eyes of insects. The principal subject of the paper is the eye of Limulus, but types of the three great groups of Arthropods — Insects, Crustacea, and Arachnids — were studied, and the results are included in the generalizations...
Seite 137 - ... (p. 150). Except that he has used " physiological isolation " where I should have used psychological segregation, this last passage is as completely in accord with what I have presented in my paper on " Divergent Evolution " as it could have been if he had copied my statements. But how is this passage, and one of similar import on page 185, to be reconciled with his own statement just quoted from page 144. On pages 217, 218 and 226, he bases his argument for the importance of different coloration...
Seite 124 - ... more commonly, to genera and families ; but, I urge further, it has not even been proved that any truly " specific " characters — those which either singly or in combination distinguish each species from its nearest allies — are entirely unadaptive, useless, and meaningless ; while a great body of facts on the one hand, and some weighty arguments on the other, alike prove that specific characters have been, and could only have been, developed and fixed by natural selection because of their...
Seite 117 - Society had sustained through the death of Mr. Dallas, and read the following resolution, which had been passed by the Council and ordered to be entered upon its Minutes : — " The Council desires to record on its Minutes an expression of its deep regret at the death of the Assistant-Secretary, Mr. Dallas, which took place on the 29th ultimo, and of its sense of the loss inflicted on the Council and Society by the removal of one who, for the long period of twenty-two years, had done them invaluable...
Seite 350 - Pascoe's Classes, Orders, &c. of the Animal Kingdom. 3s. Gd. Pascoe's List of British Vertebrate Animals. 4«.
Seite 130 - It appears as if fertility depended on such a delicate adjustment of the male and female elements to each other that unless constantly kept up by the preservation of the most fertile individuals, sterility is always ready to arise.
Seite 136 - We have, however, seen reason to believe that geographical or local isolation is by no means essential to the differentiation of species, because the same result is brought about by the incipient species acquiring different habits or frequenting a different station ; and also by the fact that different varieties of the same species are known to prefer to pair with their like, and thus to bring about a physiological isolation of the most effective kind.