The laws and mechanics of circulation, with the principle involved in animal movement . nsion and contraction under the volition of the animal. Inthe tortoise we have a ready means of demonstrating this cir- 466 DUALISM DEMONSTRATED. cumstance, by turning the animal upon its back simply, thenwatching the result. Remember, it may be the first time itwas ever upon its back, so that it would have to bring intoaction special muscles for the first time, making them performthe work it desires, which is to throw itself back again into thenormal position, or upon the plastron. Now, then, the animalwil
The laws and mechanics of circulation, with the principle involved in animal movement . nsion and contraction under the volition of the animal. Inthe tortoise we have a ready means of demonstrating this cir- 466 DUALISM DEMONSTRATED. cumstance, by turning the animal upon its back simply, thenwatching the result. Remember, it may be the first time itwas ever upon its back, so that it would have to bring intoaction special muscles for the first time, making them performthe work it desires, which is to throw itself back again into thenormal position, or upon the plastron. Now, then, the animalwill not only extend the head and neck to the full limit, butcurve them backward over the edge of the carapace, stiff androd-like, the head against the ground, to function as a lever,which is used vigorously for the purpose; at the same time,the tail also is extended and curved backward in a similarmanner over the carapace ; while the limbs in contact with thegroundwork vigorously, catching at any resisting surface. Inthis manner all the parts are employed, till at last the work is ac-. Fig. 193.—The Deep Muscles in the Tail of the Tortoise.—Bojanus. complished, the ground favorable, performed quickly and deftlyenough. Pausing to inspect the muscles of the tail, we findthat here also the rjowerful muscles are below or upon the ven-tral surface (L94, c ; 193, 50, 5J, 52, 55), the short fasciculi uponthe lateral aspect being removed in order to fully expose thesemuscles. With all the advantage of leverage against them, itis simply impossible for the short fasciculi to pull into suchforcible extension the powerful muscles in the tail, as mustappear obvious. And in the face of this overwhelming evidence to assert thatthe muscles do not possess dualism (not to mention the law inthe organs of circulation compelling this circumstance, in orderto produce the rhythmical changes in pressure), that they can-not expand as well as contract, exceeds the limits in reason andfair intelligence
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