. Cassell's natural history. Animals; Animal behavior. NATURAL HISTORY. extremity. On the whole, the Common Frog is not an extreme frequenter of water, except during the egg-laying season. Bell tells a story of a domesticated Frog, who came at meal-time, and .snugged up to the cat in cold weather; but it must have been an exceptional Fi-og. Usually they can be made not to fear their kind feeder, but the rising generation tease them and enjoy their prodigious jumps. Fisher- men use them as bait for pike, and physiologists show the circulation of the blood in the web of tlie foot, and Matteuchi
. Cassell's natural history. Animals; Animal behavior. NATURAL HISTORY. extremity. On the whole, the Common Frog is not an extreme frequenter of water, except during the egg-laying season. Bell tells a story of a domesticated Frog, who came at meal-time, and .snugged up to the cat in cold weather; but it must have been an exceptional Fi-og. Usually they can be made not to fear their kind feeder, but the rising generation tease them and enjoy their prodigious jumps. Fisher- men use them as bait for pike, and physiologists show the circulation of the blood in the web of tlie foot, and Matteuchi discovered a special galvanic energy in batteries made up of their thighs, so that on the whole, the Common Frog has little to thank humanity for. Bell stated that a large Rana had been found in Scotland, but was doubtful whether it was a variety of the Common Frog or a new species. The web of the foot forms a beautiful microscopic object, and the circu- lation of the large oval blood corpuscles, and the white or colourless corpuscles, can be seen in it The species and its varieties have a great geographical distribution. The development of the Tadpole into the Frog has been already described, and it is merely necessaiy to observe that the masses of eggs, or spawn, when first expelled, consist of numerous small opaque, globular bodies covered with a glairy substance. This absorbs a large quantity of water, and soon increases in diameter; so that the black specks, the future Tadpoles, are .separated by the glairj envelope one from another. The development of the young is more or less rapid, according to the temperature. The embryo is at first a small spherical body, one side being dark brown and the other paler. A furrow grows across the dark half, dividing it into two equal parts, and this is soon afterwards crossed by another at right angles. A third and fourth furrow are produced and so on, until the sphere is separated into as many granules. In the course of the. fOMJIOS FUU
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecta, booksubjectanimals
