. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 168 M. A. McWHINNIE AND H. M. SWEENEY to contain each factor. Since cc. was used in each assay, an extract prepared from the structures of a single animal will be designated as having a concentration of 1. Extracts were prepared of the sinus glands, optic tracts and cerebral gan- glia in effective concentrations of 15, 10, 5, , , and Another series of extracts was prepared and included connectives and thoracic cords in effective concentrations of 15, 10, 5, , and The results obtained from the two seri
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 168 M. A. McWHINNIE AND H. M. SWEENEY to contain each factor. Since cc. was used in each assay, an extract prepared from the structures of a single animal will be designated as having a concentration of 1. Extracts were prepared of the sinus glands, optic tracts and cerebral gan- glia in effective concentrations of 15, 10, 5, , , and Another series of extracts was prepared and included connectives and thoracic cords in effective concentrations of 15, 10, 5, , and The results obtained from the two series of experiments are shown in Figure 5. It can be seen that above a concentration of there is very little increase in the activity of either the dispersing or the concentrating factor. Increasing the concentration above this point results in a slightly increased rate of activity while the magnitude of the response is not appreciably altered in either case. De- creasing the concentration below this point, however, results in a decrease in both the rate and magnitude of response. Although variations in the potency of ex- tracts at low concentrations cannot be completely explained at this time, it is possible that extracts prepared from light-adapted animals contained slightly more of the factor inducing dispersion than did extracts prepared from dark-adapted animals. LJ 01 §3 & o u. 0 15 30 45 60 75 90 105 120 TIME IN MINUTES 135 FIGURE 7. Comparative dispersing activity of extracts prepared from: A—sinus glands and entire nervous systems; B—sinus glands, optic tracts and cerebral ganglia; C—sinus glands alone. All extracts were prepared in a concentration of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Wood
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