. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 510 MAURO E. MARTIGNONI AND ROBERT J. SCALLION As a basis for establishing the ion ratios in the BSS, the ionic content of four samples of pooled blood plasma (10 to 20 individuals) from sixth-instar larvae of P. sancia was determined by flame photometry. The mean contents were the following: Na, meq. per liter; K, meq. per liter; and Ca, meq. per liter. The mean mole ratios were (Na/K) and (K/Ca). These mole ratios are well in agreement with those of other related phytophagous species PH 6-6 65 6-4 6-
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 510 MAURO E. MARTIGNONI AND ROBERT J. SCALLION As a basis for establishing the ion ratios in the BSS, the ionic content of four samples of pooled blood plasma (10 to 20 individuals) from sixth-instar larvae of P. sancia was determined by flame photometry. The mean contents were the following: Na, meq. per liter; K, meq. per liter; and Ca, meq. per liter. The mean mole ratios were (Na/K) and (K/Ca). These mole ratios are well in agreement with those of other related phytophagous species PH 6-6 65 6-4 6-3 6-2 6-1 6-0. PH 6-6 6-5 64 63 62 6-1 60 10 30 50 70 90 110 sec FIGURE 2. Results of pH measurements on whole blood of 2-4-day-old sixth-instar larvae of Pcridroma saucia (Hubner), in an equilibration chamber, under a flow of: a, air; b, 5% CO2 and 95% N2; c, 20% CO2 and 80% N.; d, 100% CO*. Time: seconds from start of bleeding. (see the comprehensive compilation of Buck, 1953). It is now well established that these ionic ratios (particularly K/Ca) are very important in the formulation of physiologic solutions for insects (Ludwig, Tracey and Burns, 1957). The BSS is isotonic with the blood of sixth-instar larvae of P. saucia. The blood osmotic pressure was determined by the method of Gross (1954). This method permits determinations on samples of less than ml. volume to an. 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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