RE.sriiTS 01’ A Microscopic Study of Some Soil C'olt.oids. 
BlBLiOCJRAPHV. 
(1) Shearer, J., and (hie, W. F.— “ Analysis of Soil Colloids by X-ray Diffrac- 
tion Methods.” Joiu\ Roy, Roc. W. Aust., 1940, XXVI., p. 121. 
(2) Shearer, J., and Cole, \V. F.- — X-ray Analysis of some Fasinanian Soil 
C'Olloids.” Jour. Roy. Roc. IF. Aust., 1940, XXVL., p. 133. 
(3) Hendricks, S. B., and Fry, W. H.— “ The Results of X-ray and Micro- 
scopic examination of Soil Colloids.” Roil Scl., 1930, XXIX., pp. 
457-479. 
(4) Bray, R. H., Chhn, R. F., and Kerr, P. Ap])li(*ation of C3ay Mineral 
TechnifpK' to Illinois Clay and Shale.” Bull. Gcol. Roc. A))(cr., 1935, 
XLVl., PI). 1909-1920. 
(5) (jrim, R. E.- — “ Properties of Clay.” Recent Marhu' Sediments, A Sym- 
posium, London. 
(0) Xagelschmidt, G.— “ The Identiiication of Minerals in Soil Colloids.” 
Jour. Agr. Rci., 1939, XXIX. [4J, pp. 477 501. 
(7) Grim, R. E. — The Petrographic Study of Clay Minerals. A Laboratory 
Note.” Jour. Red. Retr., 1934, IV. [1], pp. 45-4(). 
note added IX IdPlOF-ltEADIXO. 
Since this ])a])cr was first ]n'e])are(] the antlior has Ixhui successful in 
obtaining chai'actcrisi ic relleetioiis fioin oriented aggregates of soil C()1!{)1<1 
>ianiples. A lilni of an oriented aggi’cgate of 'U^inple A Dol shows strong 
basal reflections at 7 A and 10 A indicating the in'cscnu'c of lioth kaolinitc 
and mica in the same aggregate and thus fully coulirming tlic conclusions 
r(uiclnal above on llie aggregation of soil (U)!loids. 
