The evolution theory . with the freshwater polyp. Thus Randcut off the anterior end of the polyp witli its circle of tentacles, andthe excised disk of living substance lengthened in a transverse 6 THE EVOLUTION THEORY direction, so tliat lialf the tentacles came to lie to the right, the otherhalf to the left, while the body developed between these two groups,so that they became further and further separated from each other,till finally the original transverse axis of the animal became thelono-itudinal axis. One group of tentacles survived and surroundedthe new mouth, while the other at the opp
The evolution theory . with the freshwater polyp. Thus Randcut off the anterior end of the polyp witli its circle of tentacles, andthe excised disk of living substance lengthened in a transverse 6 THE EVOLUTION THEORY direction, so tliat lialf the tentacles came to lie to the right, the otherhalf to the left, while the body developed between these two groups,so that they became further and further separated from each other,till finally the original transverse axis of the animal became thelono-itudinal axis. One group of tentacles survived and surroundedthe new mouth, while the other at the opposite aboral pole, the newfoot, died off. This total change of structure in the polyp, as to thearrangement of its main parts, points to unknown forces, whichcannot depend on the determinants as such, but on the vitalcharacters of the living parts, and on the interactions of these withone another. The same holds true of all the lower Metazoa tliat have highly 20 Dzz ?4- Jan. n Jan. 17. Jan. 5. Tehr. 19 febr. 13. Marz.
Size: 1159px × 2157px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorthomsonj, bookcentury1900, bookdecade1900, bookyear1904
