154 



" L'Hermite, Ann. Chim. Phys., (3), 43, 352 (1855). 



'* Zschokke, Chem. Technologie der Neuzeit, Bd. 1, 775. 



15 MacMichael, R. F., Brick and Clay Record, 690 (1919). 



1^ Bourry, Treatise on the Ceramic Industries (Scott, Greenwood & Son 



London, 1911). 

 1' Grout, W. Va. Geol. Survey, III. (1906). 

 18 Cushman, A. Trans. Amer. Cer. Soc, vi., 7 (1907). 

 1' Bemmelen, A. Van, z. anorg. Chem., v., 466; xiii., 233; xviii, 14; etc. 



20 Pukall, W., Berichte d. Deutsch. d. Chem. GeseUsch., 43, 2107 (1910). 



21 Brit. Assoc. Rept., II. 



" Ulzer, F., z. angow. Chem., 28, i., 308 (1915). 



23 Weston, F. E., Chem. Age., Jan. 17, 1920, pp. 58-60; see also Chem. Age., 



Jan. 31, p. 115; Feb. 7, p. 146; Feb. 14, p. 170; Mar. 6, p. 247; AprU 



3, p. 351. 



•Recent References. 



Not Included in this Report. 



Weston, F. E., Colloidal Clay, China Clay Trade Review, p. 337, 1920. 



Hay, J. Gordon, Colloidal Clay as a Catalyst in Oxidation and Hydrogenation 



Chem. Age., Feb. 21, 1920, p. 194. 

 Ormondy, W.R., The Filtration of Colloids, Soc. Chem. Ind. Conference, July, 



1920 {deals with the electro-osmosis of clays). 



