. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INDUCED METAMORPHOSIS IX NEWTS 515 TABLE I Average time in hours from initial injection for larvae of Diemictylus to through stages of primary metamorphosis Treatment Control Thyroxin Prolactin- Group I Prolactin- Group II Number of animals 17 6 6 5 Pre-melanic to melanic Melanic to gill loss Gill loss to complete metamorphosis 199.2 ± 15.6 297.6 ± 18.3 367.2 ± 5.3 208.8 ± 40.6 273.6 ±21.9 307.2 ± 6.0 168 ± 3d.4 348.8 ± 19.3 364.8 ± 6.1 crated rate of metamorphosis in thyroxin-treated animals as compared with controls from t

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INDUCED METAMORPHOSIS IX NEWTS 515 TABLE I Average time in hours from initial injection for larvae of Diemictylus to through stages of primary metamorphosis Treatment Control Thyroxin Prolactin- Group I Prolactin- Group II Number of animals 17 6 6 5 Pre-melanic to melanic Melanic to gill loss Gill loss to complete metamorphosis 199.2 ± 15.6 297.6 ± 18.3 367.2 ± 5.3 208.8 ± 40.6 273.6 ±21.9 307.2 ± 6.0 168 ± 3d.4 348.8 ± 19.3 364.8 ± 6.1 crated rate of metamorphosis in thyroxin-treated animals as compared with controls from t Stock Photo
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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INDUCED METAMORPHOSIS IX NEWTS 515 TABLE I Average time in hours from initial injection for larvae of Diemictylus to through stages of primary metamorphosis Treatment Control Thyroxin Prolactin- Group I Prolactin- Group II Number of animals 17 6 6 5 Pre-melanic to melanic Melanic to gill loss Gill loss to complete metamorphosis 199.2 ± 15.6 297.6 ± 18.3 367.2 ± 5.3 208.8 ± 40.6 273.6 ±21.9 307.2 ± 6.0 168 ± 3d.4 348.8 ± 19.3 364.8 ± 6.1 crated rate of metamorphosis in thyroxin-treated animals as compared with controls from t
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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INDUCED METAMORPHOSIS IX NEWTS 515 TABLE I Average time in hours from initial injection for larvae of Diemictylus to through stages of primary metamorphosis Treatment Control Thyroxin Prolactin- Group I Prolactin- Group II Number of animals 17 6 6 5 Pre-melanic to melanic Melanic to gill loss Gill loss to complete metamorphosis 199.2 ± 15.6 297.6 ± 18.3 367.2 ± 5.3 208.8 ± 40.6 273.6 ±21.9 307.2 ± 6.0 168 ± 3d.4 348.8 ± 19.3 364.8 ± 6.1 crated rate of metamorphosis in thyroxin-treated animals as compared with controls from the time of gill reabsorption to their emergence on land which in the former occurred within a 24-hour period. An event of major significance in these experiments was the failure of prolactin- treated larvae to complete metamorphosis despite the fact that their gills had been reabsorbed as much as two weeks before the termination of observations. In addi- tion, they showed a lower rate of metamorphosis between melanic and gill loss stages, taking as long as 15 days to make the transition, as compared to an average of 72 hours for the controls and thyroxin group. The time taken for prolactin- treated animals to pass through the pre-melanic stage was slightly less than that 20 15 Ld efts prolactin treated efts land conditioned adults adults, aquatic. 24 48 72 96 TIME IN HOURS EIGUKK 3. Per cent thyroid uptake of Im by efts, prolactin-treated efts, normal adults and land-conditioned adults. The number of land-conditioned animals used in the determination at each point is indicated. Data on other phases are modified from Waterman and Grant (1961).. 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 work.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual r

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