. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 136 VANCE TARTAR AND TZE-TUAN CHEN x pair observed. In approximately half of the cases the enucleate frag- ments agglutinated at once when, during their rapid movements, they first collided with one another (Fig. 4). Mating reaction between enucleate fragments was under these conditions apparently not so strong as between enucleate fragments and whole animals, for the pairs were easily separated by jarring, and even when not disturbed they remained attached for not longer than ten minutes. That the response is not a mere cha
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 136 VANCE TARTAR AND TZE-TUAN CHEN x pair observed. In approximately half of the cases the enucleate frag- ments agglutinated at once when, during their rapid movements, they first collided with one another (Fig. 4). Mating reaction between enucleate fragments was under these conditions apparently not so strong as between enucleate fragments and whole animals, for the pairs were easily separated by jarring, and even when not disturbed they remained attached for not longer than ten minutes. That the response is not a mere chance adherence, however, is shown by the fact that it never occurred between fragments of the same race even though these were observed to collide with one another. Although flattening at the point of contact was not observed in these small fragments, they swam together as one animal without rotating upon one another, a behavior typical of c?. FIG. 4. Mating reaction between enucleate fragments. (These fragments were later fixed and stained and were found to be enucleate.) the mating reaction. After the two reacting fragments separated, they frequently again agglutinated and became attached. Thirty enucleate fragments (15 of each race) were tested as de- scribed; and of these 16 gave the mating reaction. Each pair of reacting fragments was separately fixed and stained in iron-hematoxylin. In no case was a nucleus or part of a nucleus found in any of the fragments. Another method of observing the mating reactions between enucleate fragments consists of introducing under the dissecting microscope one fragment of one race into a drop containing several fragments of the other race and to watch the introduced fragment continuously. This procedure greatly increases the probability of the fragment finding a partner. Under these circumstances two more cases of mating reaction were observed: in one case the introduced J\IcD3 fragment remained. Please note that these images are extracted
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
