This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 Excerpt: ...root and polyp, and divided the remaining pieces ab by a transverse incision between c and d. The pieces ac were fixed in an inverted position, the pieces bd in an upright position in narrow glass tubes standing vertically, s0 that only the ends c and d were surrounded by water and could form polyps. After three days ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 Excerpt: ...root and polyp, and divided the remaining pieces ab by a transverse incision between c and d. The pieces ac were fixed in an inverted position, the pieces bd in an upright position in narrow glass tubes standing vertically, s0 that only the ends c and d were surrounded by water and could form polyps. After three days two polyps were formed on the d ends; upon the following day all the d ends carried polyps. On this day the formation of polyps only just bogan on the c ends in two of the specimens; not until four days later was regeneration complete in all the specimens. In a second experiment I used nine Tubularian stems. After three days all the d ends had polyps, while regeneration had only begun in two c ends; only three days later had regeneration begun in all of these specimens. In other experiments, also, the same results were obtained. That the orientation of the Tubularian stem toward the center of gravity has no effect I have mentioned in the preceding paper iv; and I have corroborated this finding by careful control experiments. I suggested in paper iv that regeneration perhaps occurs more rapidly at the oral pole because a distinct difference in the diameter of the lumen usually exists between the two extremities. The experiments cited above show that this suggestion is incorrect; there is no difference in diameter at a transverse section, and yet regeneration always occurs much earlier at the one cut end than at the other. 5. If the Tubularian stems used in the experiment are very turgescent, and highly pigmented, the difference in time between the formation of the oral and the aboral polyps may be very slight, and amount to only a few days. Very often one ti mis pale Tubulariae which form polyps within the usual time at the oral pole, in which, ...
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