. Carnegie Institution of Washington publication. Papers from the Marine Biological Laboratory at Tortugas. 47 water. The dotted curve applies to rnolecular MgCl2. The crosses show the effects of adding molecular dextrose to sea-water, and the black circles show the effects of increments of distilled water added to sea-water. 100. .5 .6 .7 .8 .9 Relative Concentration of Na, Ca, and K. Fig. 9. 1. Table 10 shows the decline in rate of nerve-conduction in 7 subumbrella rings of Cassiopea in sea-water diluted with a solution composed of molecular MgC^ + molecular dextrose. Ta
. Carnegie Institution of Washington publication. Papers from the Marine Biological Laboratory at Tortugas. 47 water. The dotted curve applies to rnolecular MgCl2. The crosses show the effects of adding molecular dextrose to sea-water, and the black circles show the effects of increments of distilled water added to sea-water. 100. .5 .6 .7 .8 .9 Relative Concentration of Na, Ca, and K. Fig. 9. 1. Table 10 shows the decline in rate of nerve-conduction in 7 subumbrella rings of Cassiopea in sea-water diluted with a solution composed of molecular MgC^ + molecular dextrose. Table [O. Composition of the solution, s. w. = sea-water. Relative rate of nerve-conduction, the rate in normal sea-water being loo. Ring No. I. Ring No. 2. Ring No. 3. Ring No. 4. Ring No. s. Ring No. 6. Ring No. 7. Gen. av. 100 100 100 100 100 100 100 100 90 s. w. +10 MgCh +dextrose' 75 25 60 40 SO 50 Rate an hour after being returned to normal sea-water 97 79 99 80 71 91 91 82 97 89 56 100 80 49-S 93 92 79 55 99 90 54 47-5 95 56 > Only two rings were tested in this solution and they both gave relative rates of 94. This rate is prob- ably too low to be typical, and therefore I have rejected the results obtained from these two rings and omitted them from the table. By another method, which was tried at Tortugas in 1911 and 1912, the normal osmotic pressure was maintained by adding to the sea-water a molecular solution of MgCl2 in distilled water. This causes a dilution of Table ii. Composition of the solution, n. 8. w. = natural sea-water. Gram-molecular concentration of NaCl, MgCh, CaCh, and KCl. Relative concentra- tion of the Na, ca, and k, their concen- tration in natural sea- water being i. Relative concentra- tion of the Mg, their concen- tration in natural sea- water being i. Propor- tionate con- centration of Mg com- pared with that of Na. Ca. and K, the propor- tion in nat- ural sea- vyater being i. 3-iS 4-S04 NaCl. MgCIj.
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