A Course Of Elementary Instruction In Practical Biology

Paperback | February 1, 2012

byThomas Henry Huxley

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883. Excerpt: ... XIII. THE FROG (liana temporaria and Rana esculenta). The only species of Frog indigenous in Britain is that.termed the 'common' or 'Grass Frog' (Rana temporaria), while, on the Continent, there is, in addition to this, another no less abundant species, the hind-limbs of which are considered a delicacy, whence it has received the name of the 'Edible Frog' (Rana esculenta). Unless the contrary be expressly stated, the description here given applies to both species. The Edible Frog is usually larger than the other, and is therefore more convenient for most anatomical and physiological purposes. In the body of the Frog the head and trunk are readily distinguishable; but there is no tail and no neck, the contours of the head passing gradually into those of the body, and the fore-limbs being situated immediately behind the head. There are two pairs of limbs, one anterior and one posterior. The whole body is invested by a smooth moist integument, on which neither hairs, scales, nor other forms of exoskeleton are visible; but hard parts, which constitute the endoskeleton, may readily be felt through the integument in the head, trunk and limbs. The yellowish ground-colour of the skin is diversified by patches of a more or less intense black, brown, greenish, or reddish-yellow colour, and, in the Grass Frog, there is a large, deep brown or black patch on each side of the head, behind the eyes, which is very characteristic of the species. The coloration of different frogs of the same species differs widely; and the same frog will be found to change its colour, becoming dark in a dark place, and light if exposed to the light. The body of the Frog presents only two median apertures, the wide mouth and the small cloacal aperture. The latter is situated at the posterio...

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883. Excerpt: ... XIII. THE FROG (liana temporaria and Rana esculenta). The only species of Frog indigenous in Britain is that.termed the 'commo...

Format:PaperbackDimensions:92 pages, 9.69 × 7.44 × 0.19 inPublished:February 1, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:021715042X

ISBN - 13:9780217150422

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