. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 44 EDWARD D. CRABB. due so much to the actual numbers in the vessel as to the "moral influence of numbers which inhibit exercising, just as a man does not like to take a walk on a crowded street. . ." Popovici-. FIG. i shows the effect of foul medium on growth of the shell. The individuals are all from the same mass of eggs and were isolated in tap water at or before hatching. All conditions, light, temperature, etc., except media, were kept the same in each case. Food: leaf lettuce, boiled wheat and filter paper e
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 44 EDWARD D. CRABB. due so much to the actual numbers in the vessel as to the "moral influence of numbers which inhibit exercising, just as a man does not like to take a walk on a crowded street. . ." Popovici-. FIG. i shows the effect of foul medium on growth of the shell. The individuals are all from the same mass of eggs and were isolated in tap water at or before hatching. All conditions, light, temperature, etc., except media, were kept the same in each case. Food: leaf lettuce, boiled wheat and filter paper every two or three days. B, mean length of 15 snails; medium was poured out and fresh supplied every 7 days. The deviation from the mean is — 4 at age of 51 days. C, length of the smallest individual in the 0 group. H, length of the smallest individual of the B group (not included in B). N, mean length of 14 snails, except that three died before the last measurement; therefore only n are represented in it. Excre- ment never removed but allowed to decay; fresh tap water added to maintain the standard volume. The probable error of the mean at the age of 51 days was ± ; at age 98, ± mm. Nn, length of the smallest individual of the N group. O, control (elsewhere designated as "Master Control") mean length of 15 snails; tap water; excrement siphoned off 3 times each week, all the water poured off as often as it became foul and fresh added. The probable error of the mean length at the age of 51 days was ± ; at age of 98, ± Baznosanu (1921) holds that food is the most important factor in producing growth in pond snails, and that the effect of excrement is not as important as Legendre thinks. However, Legendre. 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 Labor
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
