. The Biological bulletin. Biology; Zoology; Marine biology. EXCRETION INORGANIC PHOSPHATE IN SCULPIN 365 (2) In nineteen of the twenty-four sculpins recorded in Figs. 1 and 2 the spontaneous increase was observed when the animals were first handled, irrespective of the number of days they had been in cap- tivity. The other five animals (Nos. 12, 26, 34, 35, 36) had been catheterized from one to three times previously (see above). (3) The increase may occur irrespective of the initial concentration (first catheterization) over a wide range (1 to 81 âFigs. 1 and 2). (4) The increase is
. The Biological bulletin. Biology; Zoology; Marine biology. EXCRETION INORGANIC PHOSPHATE IN SCULPIN 365 (2) In nineteen of the twenty-four sculpins recorded in Figs. 1 and 2 the spontaneous increase was observed when the animals were first handled, irrespective of the number of days they had been in cap- tivity. The other five animals (Nos. 12, 26, 34, 35, 36) had been catheterized from one to three times previously (see above). (3) The increase may occur irrespective of the initial concentration (first catheterization) over a wide range (1 to 81 âFigs. 1 and 2). (4) The increase is transitory, in general rising to a peak and then rather rapidly diminishing to low levels. (5) It seems quite certain from the data available that the increase in urinary phosphate concentration is not associated with an increase in plasma phosphate concentration. Thus, in No. 15 (Table III), in which the urinary concentration showed a spontaneous increase in the first period and just as marked a decrease in the second period, the plasma concentration was considerably higher in the second period () than in the first (). The rate of phosphate excretion was identical in the two periods. There seems to be no direct relationship between. //â = :^:^: = :=:^- d^-^'- 11 25 24 25 26 X7 28 29" 4047 46 Houra Houri Fig. 3. Subsequent course of urinary phosphate concentration in sculpins re- corded in Fig. 2. Open and solid circles, as in Fig. 2. the absolute level of the plasma concentration and the concentration in the urine (see Table III). Three freshly caught sculpins examined at once gave the following plasma and urinary (in parentheses) phos- phate values: (190), (130) and (113) (6) As discussed above, the computed values for *' Increase in PO4 excretion" (Table I) are almost certainly minimal in most cases. A comparison of the figures for " Increase in PO^ excretion " with those for " Increase in concentratio
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