CHEMISTRY AND 1SI)USTRY
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proved to be eminently prnctical ant1 rcliable. Further and more spccific details rcgartling tho elcctroinctric dctcrrninatioos will bc found in the work of tho writer mcntioned above. REFERENCES 1 Sctlinicnts in Ink nntl in Writing, C. A. Jfitcliell and T. J. \'iird, Bniilyst, G7, Sti0 (1032). 2 JIr. 11. Scivcr, lac. cif., p. 769. 3 Inks, Circiilnr of tlic Ihrcnu of Stiiiitlnrtls, S r . 400, U.S. 1)cpt. of Coinnicrcr. 11. v. 1Iniqv nnd 1; . LOIIRC, Tintr, in Ilc~rl-l,iinge, 4th vol., p. 4. 6 \'. I.coiilitirtli, Ucitriig zur kolloitlclicm. Tccliiiologic tler Tinte, i n 11.1.1. Licqqing, Kolloitlcliciiiisclie Teclinologic, p. 404. 6 Set: (2), p. 473 E l 8 4 . see (3), 1' . 410 el Yeq. \* 0. Scliluttig and G. S. Scuinniiit, I)ic Ircacliw, 1890). 9 17. \V. ICiriricliaen:, Die Uiitcrauclrirrrg von Eiscngnllustintcn, in Siiniinlung Die clicni. Auulyse," IM. 6 (Enkr, S t u t t p r t , 1909). 10 Ucbcr tlic Einwirkuug voii Tintcn niif uictiillisrlica Eiucn, Jlitteil. nus dctn .\fntcriuliiriifitrig~itIit 37, ti3 and 322 (1019). conip. witli c. 11. JIitchc~Il iind T. C. Hqworth, h k w , :Ird ccl.. p. 109 (Cliiis. Griffin fi Co., I h l . , Imdon, 1924).