. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 200 WILLIAM N. ETKIN TABLE II Stage 2 Stage 5 Prepara- tion No. Gross Weight grams Dry Weight grams Dry Weight Prepara- tion No. Gross Weight grams Dry Weight grams Dry Weight Gross Weight per cent Gross Weight per cent 27 .088 34 .611 .089 28 .120 25 .710 .093 29 .134 36 .743 .109 30 .069 37 .742 .106 31 .094 38 .187 32 .060 40 .755 .111 Average .094 ± .2 Average .801 .116 ± .3 Keeping these limitations in mind, we see th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 200 WILLIAM N. ETKIN TABLE II Stage 2 Stage 5 Prepara- tion No. Gross Weight grams Dry Weight grams Dry Weight Prepara- tion No. Gross Weight grams Dry Weight grams Dry Weight Gross Weight per cent Gross Weight per cent 27 .088 34 .611 .089 28 .120 25 .710 .093 29 .134 36 .743 .109 30 .069 37 .742 .106 31 .094 38 .187 32 .060 40 .755 .111 Average .094 ± .2 Average .801 .116 ± .3 Keeping these limitations in mind, we see that the amount of thyroid (cell number or colloid volume) per unit volume of tissue increases but slightly if at all until the hind legs start growing actively. It then shows a remarkable rise, reaching a high point three or four times the original level at the beginning of resorption of the tail (fourth stage). During this stage the behavior of this ratio is prob- lematical, but after metamorphosis it suffers an equally remarkable loss to about one third its previous value. H 7 F~ STAGE. \ I I \ \ I I 14 20 6 BODY LENGTH IS 25 35 45 HIND LEG LENGTH 55 65 MM. FIG. 1. Ratio of cell count to the cube of the body length plotted against body or hind leg 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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