Chapters on EvolutionChatto & Windus, 1883 - Всего страниц: 383 |
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Стр. xv
... Pollen - grains emitting Pollen - Tubes 316 . 266 221. Pollen - masses of Orchid . 180. Polynema · 316 267 181. Campodea . 222. Pollen - grain of Evening Primrose 269 ( magnified ) . 316 185. Foraminifera 182. Lindia 183. Gregarina and ...
... Pollen - grains emitting Pollen - Tubes 316 . 266 221. Pollen - masses of Orchid . 180. Polynema · 316 267 181. Campodea . 222. Pollen - grain of Evening Primrose 269 ( magnified ) . 316 185. Foraminifera 182. Lindia 183. Gregarina and ...
Стр. 82
... pollen . " These organs are the " stamens " ( st ) . Lastly , in the centre of the flower we note the pistil " ( p ) , or organ devoted to the production of " ovules . " The latter , when duly fertilised by being brought into contact ...
... pollen . " These organs are the " stamens " ( st ) . Lastly , in the centre of the flower we note the pistil " ( p ) , or organ devoted to the production of " ovules . " The latter , when duly fertilised by being brought into contact ...
Стр. 131
... pollen , by which the " ovules " are fertilised and converted into the fertile " seeds . " Last of all , and in the centre of the flower , the pistil ( p ) is to be noted . This 132 A GOON ! B part consists of one or. K 2 EVIDENCE ...
... pollen , by which the " ovules " are fertilised and converted into the fertile " seeds . " Last of all , and in the centre of the flower , the pistil ( p ) is to be noted . This 132 A GOON ! B part consists of one or. K 2 EVIDENCE ...
Стр. 132
... pollen ) are contained . Thus much by way of a brief lesson in elementary botany . Now , when we study the bracts , we find that insensibly these have a tendency in many flowers to become like the green sepals of the calyx . Look at a ...
... pollen ) are contained . Thus much by way of a brief lesson in elementary botany . Now , when we study the bracts , we find that insensibly these have a tendency in many flowers to become like the green sepals of the calyx . Look at a ...
Стр. 133
... pollen . This head seems to represent the folded blade of the staminal leaf , but have we any proof that our conjecture is probable or correct ? Let the facts of botany reply . Here is a Petunia , for instance , in which the stamens are ...
... pollen . This head seems to represent the folded blade of the staminal leaf , but have we any proof that our conjecture is probable or correct ? Let the facts of botany reply . Here is a Petunia , for instance , in which the stamens are ...
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adult air-bladder Amoeba animal or plant animal world animalcule animals and plants appear appendages ascidian Axolotl barnacle become biological bird body bone buds Campodea carpels cells changes chiton cilia colonial common connected constitution crab cross-fertilisation crustaceans curious Darwin degeneration descent discover evolution exhibit existence fact favour fertilisation firstly fish flowers fossil frog geological germ gills higher animals idea illustrated individual insects jaws lampshells lancelet larva larvæ latter life-history likewise limbs living lobster marsupials ment metamorphosis missing links modification molluscs named naturalist nature Nauplius neighbours notochord organisation organs origin pairs phases pistil pollen pollen-grains possess present primitive primrose produced protoplasm pteropod quadrupeds race regarded remarks represented reptiles resemblance Sacculina scientific sea-squirt seen segments skull species spine sponge stage stamens Starfishes stigma structure tail theory tion to-day trace variation varied vertebrate whilst wings worm young zoophyte