American journal of pharmacy . 78). This Journal, Vol. 62, 333, (1890).? l^roc. A. Ph. A. 1910, 1104. Prar. Kansas Ph. A. 1897, 15; Proc. A. Ph. A. 46, 683, (1898). -Drii^. Circ. 1897, 212; Proc. A. Ph. A. 1898, 685.^ Proc. Mass. Ph. A. 5, x-jo, fi886); Proc. A. Ph. A. 1887, Joiir. 68, 336, (1902). Senna leaves Eucalyptus leaves • .50 82 .51 72 .7975 32 866 The Theory of Percolation. !Am. Jour. , 1920. process suitable for the extraction of alkaloid drugs. Bird^ approvedof the process and Musset^ recommended repercolation for thepreparation of • fiuide
American journal of pharmacy . 78). This Journal, Vol. 62, 333, (1890).? l^roc. A. Ph. A. 1910, 1104. Prar. Kansas Ph. A. 1897, 15; Proc. A. Ph. A. 46, 683, (1898). -Drii^. Circ. 1897, 212; Proc. A. Ph. A. 1898, 685.^ Proc. Mass. Ph. A. 5, x-jo, fi886); Proc. A. Ph. A. 1887, Joiir. 68, 336, (1902). Senna leaves Eucalyptus leaves • .50 82 .51 72 .7975 32 866 The Theory of Percolation. !Am. Jour. , 1920. process suitable for the extraction of alkaloid drugs. Bird^ approvedof the process and Musset^ recommended repercolation for thepreparation of • fiuidextracts. Scoville^ stated that repercolationis satisfactory for the extraction of resinous drugs. In expert hands the process of Squibb gives excellent resultswith menstrua which do not contain a large proportion of the extraction of those drugs which, like gentian, rhubarb, kino,and Phytolacca, yield large quantities of extractive soluble in dilutedalcohol the simpler process is preferable but repercolation may. PROF. C. LEWIS DIEHLA painstaking worker on fiuidextracts and the processes of percolation. be applied to advantage in the extraction of ginger, cimicifuga,ergot, hydrastis, gelsemium, and especially where such solvents asacetone, chloroform, ether, or ligroin are used as menstrua. INTERRUPTED PERCOLATION. Interrupted or suspended percolation is the name given to avariation of the ordinary process of simple percolation by C. ^ The practise in this case is founded upon sound principles ^ Pharm. Jour. 54, 158, (1894). 2 Pharm. Centr. 1897, 862; Proc. A. Ph. A. 1898, 681. ^ Proc. A. Ph. A. 1910, 1114. (Discussion.) * Proc. Calif. Ph. A. 1892, 123. Am. Jour. Pharm. )December, 1920. ) The Theory of Percolation. 867 and has been approved by many students of extraction. It isbased upon the idea of combining maceration with percolation insuch a way that every portion of fresh mentruum added to a drugin a percolator shall have as much or more opportunity
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