Principles of Zoology: Touching the Structure, Development, Distribution ...
Principles of Zoology: Touching the Structure, Development, Distribution ...
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equally concerned in effecting locomotion, or only some ot its parts are employed for the purpose.
165. The jelly-fishes (Medussa) swim by contracting their umbrella -shaped bodies upon the water below, and its resistance urges them forwards. Other animals are provided with a sac or siphon, which they may .fill with water and suddenly force out, producing a jet, which is resisted by the surrounding ^^' water, and the animal is thus propelled.
The Biche-le-mar, (Holothuria,) the cuttle-fishes, t...he Salpse, &c., move in this way.
166. Others contract small portions of the body in suc- cession, which being thereby rendered firmer, serve as points of resistance, against which the animal may strive, in urging the body onwards. The earth-worm, -whose boJy is composed of a series of rings united by muscles, and shutting more or less into each other, has only to close up the rines at one or more points, to form a sort of fulcrum, against which the rest of the body exerts itself in extending forwards.
What to read after Principles of Zoology: Touching the Structure, Development, Distribution ...?
You can find similar books in the "Read Also" column, or choose other free books by Louis Agassiz to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
equally concerned in effecting locomotion, or only some ot its parts are employed for the purpose.
165. The jelly-fishes (Medussa) swim by contracting their umbrella -shaped bodies upon the water below, and its resistance urges them forwards. Other animals are provided with a sac or siphon, which they may .fill with water and suddenly force out, producing a jet, which is resisted by the surrounding ^^' water, and the animal is thus propelled.
The Biche-le-mar, (Holothuria,) the cuttle-fishes, t...he Salpse, &c., move in this way.
166. Others contract small portions of the body in suc- cession, which being thereby rendered firmer, serve as points of resistance, against which the animal may strive, in urging the body onwards. The earth-worm, -whose boJy is composed of a series of rings united by muscles, and shutting more or less into each other, has only to close up the rines at one or more points, to form a sort of fulcrum, against which the rest of the body exerts itself in extending forwards.
What to read after Principles of Zoology: Touching the Structure, Development, Distribution ...?
You can find similar books in the "Read Also" column, or choose other free books by Louis Agassiz to read onlineMoreLess
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