. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 4 / 2 / I / I / I / I / I / FIGURE 5. Correlation of width/length of the spicule with calcium concentration (re- gardless of calcium/magnesium). Calcium and magnesium concentrations expressed by frac- tions of normal amounts (cf. Table II). Fraction at bottom of each figure indicates calcium/ magnesium in medium. Numerals in parentheses indicate hours after transfer. ions were calculated on the basis that respective amounts in natural sea water are , 1/100, 1/100 and M. In each ser
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 4 / 2 / I / I / I / I / I / FIGURE 5. Correlation of width/length of the spicule with calcium concentration (re- gardless of calcium/magnesium). Calcium and magnesium concentrations expressed by frac- tions of normal amounts (cf. Table II). Fraction at bottom of each figure indicates calcium/ magnesium in medium. Numerals in parentheses indicate hours after transfer. ions were calculated on the basis that respective amounts in natural sea water are , 1/100, 1/100 and M. In each series, the concentration of calcium was changed to 10/10, 4/10, 2/10 and 1/10 that of natural sea water, potassium and sulfate being kept at the normal level. The concentration of magnesium, on the other hand, was varied among the four series; it was maintained at the normal amount in Series 1, reduced to 1/2 in Series 2 and to 1/10 in Series 3. while in Series 4, the magnesium was added in a gradient (10/10, 4/10, 2/10 and 1/10) similar to that of the calcium concentration (see Table II). The pH of each resultant medium was adjusted to by bicarbonate buffer. Series 1 is the same as the calcium-low media used in Part 1, the left member of the series containing 10/10 calcium and 10/10 magnesium, which correspond to natural sea water in 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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