890  The  Theory  of  Percolation.  |  *^ DeiXr'^YS: 
1910.  Correspondence  on  the  Relative  \"alue  of  Maceration  and  Percolation. 
H.  V.  Arny,  C.  F.  Nixon,  E.  A.  Ruddiman,  E.  L.  Patch,  W.  L.  Scoville,  P.  Asher, 
J.  M.  Francis,  Leo  Eliel,  H.  A.  B.  Dunning.  I.  A.  Becker,  A.  J.  P.,  Vol.  82,  187. 
1910.  Arny,  H.  V.  and  Oxley,  F.  H.  "Fluidextracts  and  Repercolation." 
Proc.  A.  Ph.  A.  1910,   1 104. 
1910.    Linke,  H.   Fluidextracts.  Apoth.  Ztg.  2s,  522.  A.  J.  P.,  Vol.  82.485. 
1913.  Pearson,  W.  A.  "The  Physiological  Activity  of  Acetic  Fluidextract 
of  Digitahs."    A.  J.  P.,  Vol.  85.  245. 
1 9 14.  Maines  and  Gardner.  "Total  Extractive  as  a  Factor  in  Fhiidextract 
Manufacture."    J.  Am.  Ph.  A.  3,  ggj.    A.  J.  P.,  Vol.  86,  418. 
191 7.  Eloyd,  J.  U.  "Percolation  and  Fluidextracts."  Kolloidchem.  Bei. 
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1 91 7.  Palme,  H.  and  Winborg,  G.  "The  Absorption  Phenomenon  in  the 
Extraction  of  Alkaloids  from  Drugs."    Svensk.  Farm.  Tidskrift.  21,  21,  37. 
191 7.  Hawley,  L.  F.  "Discontinuous  Extraction  Processes."  /.  Ind. 
Eng.  Chem.  9,  866. 
1917.  Lloyd,  J.  U.    "Solvents  in  Pharmacy."    /.  Am.  Ph.  A.  6,  940. 
1918.  Lloyd,  J.  U.    "Solvents  in  Pharmacy."    /.  Am.  Ph.  A.  7,  137. 
1 91 8.  Beard,  J.  G.  "Continuous  Percolation  under  Reduced  Pressure." 
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1919.  Couch,  J.  F.  "The  Early  History  of  Percolation."  .4.  /.  P.,  Vol. 
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Some  of  the  more  important  contributors  to  the  theory  and  practise  of 
percolation  are  listed  below  with  references  to  their  memoirs. 
Arny,  H.  V.,  Proc.  A.  Ph.  A.  1892,  169;  1910,  1104. 
Bell,  J.,  Pharm.  J.,  1654  (1842);  19-  5  (1859)- 
Beringer,  G.  M.,  A.  J.  P.,  Vol.  79,  410,  (1907);  Vol.  80,  525,  (1908);  Vol. 
81,  475,  (1909)- 
Boullay,  Pere  et  fils.,  J.  de  Pharm.  19,  281,  393,  (1833);  21,  i,  i88,  (1835.) 
Diehl,  C.  L.,  A.  J.  P.,  Vol.  41,  337,  (1869);  Proc.  A.  Ph.  A.  1878,  104,  68r, 
1879,  727;  1880,  424;  Pharm.  Rund.  725,  60,  (1889). 
Duhammel,  A.,  A.  J.  P.,  Vol.  10,  i,  (1838);  Vol.  11,  189,  (1839). 
Graham,  I.  J.,  A.  J.  P.,  Vol.  31,  354,  (1859). 
Lloyd,  J.  U.,  A.  J.  P.,  Vol.  50,  i,  15,  434,  (1878) ;  Vol.  56,  449,  (1848);  Vol.  80. 
39,  (1908)  Proc.  A.  Ph.  A.  1877,  405,  408;  1878,  755;  1879-  682;  1881,  408;  1882, 
508;  1883,  336;  1884,  410;  1885.  411;  1886,  38;  1887,  532;  West.  Drug.  11,  159, 
(1889);  Pharm.  Rmid.  7,  165,  (i88g);  J.  Am  Ph.  A.  6,  940,(1917);  7,  137,  (1918). 
Moore,  J.  B.,  A.  J.  P.,  Vol.  46,  497,  55i,  (1874) ;  Pharm.  J-  T.  34.  546,  (1875)- 
Parrish,  E.,  A.  J.  P.,  Vol.  31,  327,  (1859). 
Procter,  W.,  A.  J.  P.,  Vol.  11,  189,  (1839);  Vol  13,  182,  (1847);  Vol.  29,  108, 
(1857);  Vol.  31,  317,  (1859);  Vol.  31,  530,  (1859);  Vol.  36,  I  (1864);  Vol.  41,  295, 
(1869);  Pharm.  J.  19,  139,  (1859). 
Redwood,  T.,  Pharm.  J.  23,  533,  (1864). 
Remington,  J.  P.,  A.  J.  P.,  Vol  46,  7,  (1874);  Vol.  69,  2 1 1,  (1897) ;  Vol.  70, 
543,  (1898);  Merck's  Report  6,  219,  (1897);  Drug.  Circ.  1884,  148. 
Robbins,  A.,  A.  J.  P.,  Vol.  50,  329,  (1878). 
Robiquet,  E-,  /  de  Pharm.  17.  279,  (1831);  19,  322,  (1833);  20,  79,  (1834)  ; 
21,  113,  (1835). 
