Elements of Entomology An Outline of the Natural History And Classification of
Elements of Entomology An Outline of the Natural History And Classification of
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In our eReader you can find the full English version of the book. Read Elements of Entomology An Outline of the Natural History And Classification of Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Elements of Entomology An Outline of the Natural History And Classification of
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Quercus gemma], by punc- turing the young terminal buds > produces a singular THE GALL-FLIES. 247 scaly gall, which has been compared to a miniature artichoke. Several other species are nourished upon different parts of the oak-tree, and one (the C. \Bio- rhiza] aptera) even resides in galls upon its root.
All these galls, even those of different species upon the same part of the free, exhibit a difference of size, form, and structure so considerable, that it seems sur- prising how causes so ne...arly identical can produce such various results, and many theories have been put forward to account for the formation of these cu- rious excrescences. None of these however, plausible though they may be, can account for the phenomena, and we can scarcely go beyond the bare statement of facts given above. Most of the conjectures of authors attribute the formation of galls to an extravasation of sap, but this can never account for the production of regularly organized structures, such as the majority of these excrescences are.
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You can find similar books in the "Read Also" column, or choose other free books by W S William Sweetland Dallas to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Quercus gemma], by punc- turing the young terminal buds > produces a singular THE GALL-FLIES. 247 scaly gall, which has been compared to a miniature artichoke. Several other species are nourished upon different parts of the oak-tree, and one (the C. \Bio- rhiza] aptera) even resides in galls upon its root.
All these galls, even those of different species upon the same part of the free, exhibit a difference of size, form, and structure so considerable, that it seems sur- prising how causes so ne...arly identical can produce such various results, and many theories have been put forward to account for the formation of these cu- rious excrescences. None of these however, plausible though they may be, can account for the phenomena, and we can scarcely go beyond the bare statement of facts given above. Most of the conjectures of authors attribute the formation of galls to an extravasation of sap, but this can never account for the production of regularly organized structures, such as the majority of these excrescences are.
What to read after Elements of Entomology An Outline of the Natural History And Classification of?
You can find similar books in the "Read Also" column, or choose other free books by W S William Sweetland Dallas to read onlineMoreLess
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