Fundamentals of BotanyP. Blakiston's Son & Company, 1916 - 640 páginas This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant. |
Contenido
| 103 | |
| 113 | |
| 125 | |
| 146 | |
| 147 | |
| 168 | |
| 179 | |
| 193 | |
| 209 | |
| 212 | |
| 222 | |
| 227 | |
| 242 | |
| 268 | |
| 306 | |
| 316 | |
| 489 | |
| 491 | |
| 502 | |
| 510 | |
| 520 | |
| 541 | |
| 549 | |
| 569 | |
| 578 | |
| 592 | |
| 615 | |
| 621 | |
| 623 | |
| 631 | |
Otras ediciones - Ver todas
Términos y frases comunes
Algæ ancestors Angiosperms antheridia appear archegonia bacteria beans bearing become branches called carbon carpellate caused cell-wall cells CHAPTER characters chlorophyll cone Cordaitales corolla cotyledons Cycadofilicales cycads Darwin dicotyledons disease embryo entire enzymes epidermis evolution fact female fermentation fern fertilized egg filament flowers formation forms fossil fungi fungus gametes gametophyte geological germination green growing growth heredity hybrid illustrated inheritance layer leaf leaves liverworts living longitudinal section Lycopodiales male mature megaspores membrane Mendel method monocotyledons mosses mutation mycelium natural occur oögonia oösperm organs ovary ovule oxygen parasite parent petals petiole phyte pistillate plant body plants and animals Pleurococcus pollen pollen-grains pollen-tube portion produced prothallus protoplasm reproduction resemble result roots seed-bearing seeds showing soil species sperms sporangia sporangium spore-case spores sporophyte stamens stem sterile stomata strobilus structure substances surface thallus tion tissue tree variation various vegetative yeast zygote
Pasajes populares
Página 512 - I happened to read for amusement ' Malthus on Population,' and being well prepared to appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits of animals and plants, it at once struck me that under these circumstances favourable variations would tend to be preserved, and unfavourable ones to be destroyed. The result of this would be the formation of new species. Here then I had at last got a theory by which to work...
Página 586 - I look at the geological record as a history of the world imperfectly kept, and written in a changing dialect; of this history we possess the last volume alone, relating only to two or three countries. Of this volume, only here and there a short chapter has been preserved; and of each page, only here and there a few lines.
Página 513 - A plant which annually produces a thousand seeds, of which only one on an average comes to maturity, may be more truly said to struggle with the plants of the same and other kinds which already clothe the ground. The mistletoe is dependent on the apple and a few other trees, but can only in a far-fetched sense be said to struggle with these trees, for, if too many of these parasites grow on the same tree, it languishes and dies. But several seedling mistletoes, growing close together on the same...
Página 515 - It is interesting to contemplate a tangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the damp earth...
Página 515 - A celebrated author and divine has written to me that he has "gradually learnt to see that it is just as noble a conception of the Deity to believe that He created a few original forms capable of self-development into other and needful forms, as to believe that He required a fresh act of creation to supply the voids caused by the action of His laws.
Página 512 - Seedlings, also, are destroyed in vast numbers by various enemies ; for instance, on a piece of ground three feet long and two wide, dug and cleared, and where there could be no choking from other plants, I marked all the seedlings of our native weeds as they came up, and out of the 357, no less than 295 were destroyed, chiefly by slugs and insects.
Página 513 - Darwin introduced the struggle for existence in the third chapter of the Origin of Species, writing about it as follows: I should premise that I use the term struggle for existence in a large and metaphorical sense, including dependence of one being on another, and including (which is more important) not only the life of the individual, but success in leaving progeny.
Página 516 - Thus, from the war of nature, from famine and death, the most exalted object which we are capable of conceiving, namely, the production of the higher animals, directly follows. There is grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved.
Página 549 - ... characters, on the other hand, unite in the hybrid to form a new character, which in the progeny of the hybrid is usually variable. The object of the experiment was to observe these variations in the case of each pair of differentiating characters, and to deduce the law according to which they appear in the successive generations. The experiment resolves itself therefore into just as many separate experiments as there are constantly differentiating characters presented in the experimental plants.
Página 515 - When we no longer look at an organic being as a savage looks at a ship, as at something wholly beyond his comprehension ; when we regard every production of nature as one which has had a history ; when we contemplate every complex structure and instinct as the summing up of many contrivances...