. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. I I I I I I I I 15 30 45 60 75 90 105 120 4 i— 3 2 I LEG NERVE SG ov. (0 crobs ^lYESTALK MUSCLE SG ov 6 crabs I I I I I I I 15 30 45 60 75 90 105 120 ACETYL CHOLINE CHLORIDE av. 9-crobs 9-5" IO'8. 15 30 45 60 75 90 105 120 FARADIC STIMULATION OF EYESTALK STUBS av. 9 crobs I I I I I 15 30 45 60 75 90 105 120 FIGURE 2. Responses of Hemigrapsus melanophores. Explanation same as for Figure 1. carapace width. This made it possible simply to measure the carapace width and to inject the proper amount. Injections were m
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. I I I I I I I I 15 30 45 60 75 90 105 120 4 i— 3 2 I LEG NERVE SG ov. (0 crobs ^lYESTALK MUSCLE SG ov 6 crabs I I I I I I I 15 30 45 60 75 90 105 120 ACETYL CHOLINE CHLORIDE av. 9-crobs 9-5" IO'8. 15 30 45 60 75 90 105 120 FARADIC STIMULATION OF EYESTALK STUBS av. 9 crobs I I I I I 15 30 45 60 75 90 105 120 FIGURE 2. Responses of Hemigrapsus melanophores. Explanation same as for Figure 1. carapace width. This made it possible simply to measure the carapace width and to inject the proper amount. Injections were made at the base of a walking leg. The strength of each extract is expressed in terms of the volume of a sinus gland of the crab injected. Thus " SG" (cf. Fig. 1) indicates that a crab injected with 5 per cent of its body weight of this extract received a volume of tissue approximately equal to times the volume of one of its own sinus glands. EXPERIMENTS AND RESULTS The results of the injections are shown in Table II and in the graphs of Figures 1 and 2. Responses are classified as "weak" wrhen the melanin was not dispersed beyond stage 2, and "good" when stage 3 was reached. The average responses do not include, those animals which failed to respond. The validity of averaging the arbitrary figures of the melanophore index is subject to criticism (Parker, 1948, pp. 14—15), and the variability of response, shown in Table II, must be con- sidered when evaluating a response. By far the most potent extracts were those of sinus glands. Other extracts from comparable volumes of tissue, while in some cases acting as rapidly as sinus gland extracts, did not produce the maximum and sustained responses which always followed injections of the latter. Moreover, the only extracts which always pro- duced 100 per cent "good" responses were those of sinus glands. The more rapid. Please note that these images are extracted from scanned page imag
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
