. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 37O HARRY BEAL TORREY AND BENJAMIN HORNING. We are aware that such variability is a source of difficulty in the interpretation of results. It is greatest in the first few weeks after hatching, when it is attributable partly to irregularities in nutrition and to differences of vigor referable to other causes. These tend to disappear with age. But the constitutional varia- bility of the Rhode Island Red breed, which we have learned to recognize in the course of our work, remains as a source of error. All of our experiments hav
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 37O HARRY BEAL TORREY AND BENJAMIN HORNING. We are aware that such variability is a source of difficulty in the interpretation of results. It is greatest in the first few weeks after hatching, when it is attributable partly to irregularities in nutrition and to differences of vigor referable to other causes. These tend to disappear with age. But the constitutional varia- bility of the Rhode Island Red breed, which we have learned to recognize in the course of our work, remains as a source of error. All of our experiments have been checked in other breeds, notably in Leghorns (Torrey and Horning, 1925) and Campines, where. FIG. 5. R. I. R. female (No. 13, Table I.) twelve weeks old; thyroid fed for eight weeks. the forcing effect of thyroid feeding on the development of the plumage is clear and definite. In the latter breeds, however, the first rectrices normally develop simultaneously in both sexes. The variability of Rhode Island Reds led us formerly into a conclusion that proved to be erroneous. In the first series of experiments reported, our five thyroid-fed capons failed to develop rectrices like unaltered thyroid-fed males. Later it was discovered that this result was exceptional. The gonad had, in the male, no bearing on the 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 (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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