On Parthenogenesis
On Parthenogenesis
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In our eReader you can find the full English version of the book. Read On Parthenogenesis 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 On Parthenogenesis
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By these the ova are developed, impreg- nated and oviposited, and thus provision is made for dis- seminating the individuals and for continuing the existence of the species over the severe famine-months of winter.
The metamorphosis in all insects is attended with the casting off or creeping out of a certain proportion of the precedent individual, which process is called the ^ecdysis* or moult. With regard to the so-called metamorphoses which issue in the succession of a fixed, blind, sessile mu...ltivalve barnacle to a free-swimming crustacean with pedunculated eyes*, or in the succession of a rooted vermiform parasite to a natatory animal with articulated setigerous limbs t — when these phaenomena are closely traced, they are seen to depend in a greater degree upon the action and coalescence of retained cells, than upon a change of pre-existing tissues. If the development of the ovum in the pedunculate ovarian sac of the low organized crustaceous epizoon of a fish be closely traced, the peripheral cells of the germ-mass are seen to combine and coalesce to form the smooth transparent skin of the * J.
What to read after On Parthenogenesis?
You can find similar books in the "Read Also" column, or choose other free books by Richard Owen to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
By these the ova are developed, impreg- nated and oviposited, and thus provision is made for dis- seminating the individuals and for continuing the existence of the species over the severe famine-months of winter.
The metamorphosis in all insects is attended with the casting off or creeping out of a certain proportion of the precedent individual, which process is called the ^ecdysis* or moult. With regard to the so-called metamorphoses which issue in the succession of a fixed, blind, sessile mu...ltivalve barnacle to a free-swimming crustacean with pedunculated eyes*, or in the succession of a rooted vermiform parasite to a natatory animal with articulated setigerous limbs t — when these phaenomena are closely traced, they are seen to depend in a greater degree upon the action and coalescence of retained cells, than upon a change of pre-existing tissues. If the development of the ovum in the pedunculate ovarian sac of the low organized crustaceous epizoon of a fish be closely traced, the peripheral cells of the germ-mass are seen to combine and coalesce to form the smooth transparent skin of the * J.
What to read after On Parthenogenesis?
You can find similar books in the "Read Also" column, or choose other free books by Richard Owen to read onlineMoreLess
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