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Their ancestors also had long tails and gills like the gilled Amphibia, as the tail and the gill-arches of the human embryo clearly show. For comparative anatomical and ontogenetic reasons, we must not seek these amphibian ancestors of ours as one would be inclined to do, perhaps among the tail-less Batrachia, but among the tailed lower Amphibia.
But what we see here in the development of the individual has happened to the whole class in the course of its stem-history. The metamorphosis goes farther in a third order of Amphibia, the Batrachia or Anura, than in the salamander. To this belong the various kinds of toads, ringed snakes, water-frogs, tree-frogs, etc.
A full pocket balances an empty skull as a good heart cannot; a plethoric pocket overshadows monstrous vices. But at his cleanly best, John's pockets are an integral part of his personality. He feels after his pocket instinctively while yet in what corresponds in the genus homo with the polywog state in batrachia.
The whole matter is analogous to, nay dependent on, the fact that the higher an animal stands in the scale of development, the easier can it be killed by wounding it in a single place. Take, for instance, batrachia: they are as heavy, clumsy, and slow in their movements as they are unintelligent, and at the same time extremely tenacious of life.
Take, for example, batrachia: they are slow, cumbrous and sluggish in their movements; they are unintelligent, and, at the same time, extremely tenacious of life; the reason of which is that, with a very small brain, their spine and nerves are very thick.
Here too are those curious snakes which are equally thick at either end a peculiarity which has earned for them the appellation of double-headed, and the supposed power of walking indifferently forwards or backwards. The visitor now approaches the called by zoologists after the Greek name, Batrachia.
When the Batrachia above mentioned were discovered, they appeared inanimate, but the influence of a warm sun to which they were subjected soon imparted to them a moderate degree of vigor. In a few hours from the time they were liberated they were tolerably active, and able to move from place to place apparently with great ease."
In the warm-blooded is developed the capacity to maintain a fixed temperature while that of the surrounding medium changes. The brain and nervous system display the same progressive ascent from the brainless acrania, up through the fishes, batrachia, reptiles, and birds to the top in mammals.
Batokas, knocking out two upper incisors. Batrachia, eagerness of male. Bats, scent-glands; sexual differences in the colour of; fur of male frugivorous. Battle, law of; among beetles; among birds; among mammals; in man. Beak, sexual difference in the forms of the; in the colour of the. Beaks, of birds, bright colours of.
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