. The London, Edinburgh and Dublin philosophical magazine and journal of science. for tube A. Therefore, assumingas is proved in I. that the amount absorbed from these solu-tions in a short time is proportional to the strengths of the * See Phil. Mag. July 1910, pp. 15, Phil. Mag. July 1910, p. 27. Date,1909. Period of exposure Air alone. : A Solution. Vol. of air inlitres. Emana-tioncaught. Tube. aii-inlitres. i TotalEmana-tion caught. Emanation caughtfrom thesolution. Oct. 2fi 27. 224 hrs. 633 11 B 660 47 4-7-1-2=3-5 „ 27-28. 21 „ B 607 •9 A 040 41 41- -8=33 : „ 28-
. The London, Edinburgh and Dublin philosophical magazine and journal of science. for tube A. Therefore, assumingas is proved in I. that the amount absorbed from these solu-tions in a short time is proportional to the strengths of the * See Phil. Mag. July 1910, pp. 15, Phil. Mag. July 1910, p. 27. Date,1909. Period of exposure Air alone. : A Solution. Vol. of air inlitres. Emana-tioncaught. Tube. aii-inlitres. i TotalEmana-tion caught. Emanation caughtfrom thesolution. Oct. 2fi 27. 224 hrs. 633 11 B 660 47 4-7-1-2=3-5 „ 27-28. 21 „ B 607 •9 A 040 41 41- -8=33 : „ 28-29. 15 „ A 452 •7 B 448 36 36- -7=29 7 „ A 212 1-3 B 214 3-2 3-2-P4 = r8 °-3 21 „ B 647 22 A 657 5-2 5-2-2-0=3-2 „ 3-4 ... 21 „ A 637 2-6 B 631 7 2 7-2-2-9=38 „ 5 7 ,, B 211 •6 A 213 20 20- -6=1-5 7 „ A 210 11 B 209 28 28—11 = 1-7 Radium Emanation hi) Coconut Charcoal. 783 solutions, the amount absorbed from the one one-fifth solutionin 3 hours shonld be 9 for tube B and a little less for tube is in good agreement with tig. 1. Fur. 8 11 16 20 EXPOSURE (Houts). The results of these experiments show that in the earlystages not much of the emanation is allowed to pass throughthe charcoal unabsorbed. In the later stages, however, muchof the emanation is allowed to pass. From fig. 1 it follows that if we suppose complete absorp-tion to occur for exposures of 3 hours or less, then B for a21-hours exposure absorbs about 62 per cent, of the emanationsent through it. The state of affairs is probably very similarto that discovered by McBain * for the absorption of hydrogenby charcoal, viz. that the absorption is twofold : a quickeffect—a surface condensation—being followed by a slowereffect—a diffusion into the interior. III. Effect of the Humidity of the Air. As no drying agent was used in the experiments describedin II., the results may be due to the fact that as time went onthe charcoal tube attached to the radium solution would * Ph
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