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Published online by Cambridge University Press: 14 March 2018
Palmer's investigation of the chemical and mineralogical aspects of soil-forming processes was restricted to comparative chemical analyses of the weathered shells and the essentially unaltered cores of certain spheroidal basic boulders from Wahiawa in the Hawaiian Islands.
The present writer describes an experimental approach to the general problem of rock-weathering on lines suggested by Dr. A. Brammall:
(a) Electrodialysis of eight typical rock-forming mineral silicates, each of which was dialysed separately after having been ground to an impalpable powder and analysed in detail.
(b) Assessment of the effect of dialysis by comparing the composition of the unaltered mineral with that of the slime left in the mineral-chamber when dialysis was virtually at an end.
(c) X-ray and kathode-ray tests on three of these minerals and the corresponding slimes, to ascertain whether colloidal end-products associated with, or coating, particles of unaltered mineral had integrated to form one or other of the specific ‘crystalline colloids’ identifiable in soils and clays.
page 137 note 1 Palmer, H. S., Soil Sci., 1931, vol. 31, pp. 253–265.CrossRefGoogle Scholar
page 137 note 2 Brammall, A. and Leech, J. G. C., Sci. Journ. Roy. Coll. Sci. London, 1943, vol. 13, pp. 46–58.Google Scholar
page 137 note 3 For reasons directly due to war-time conditions, the number of minerals and slimes submitted for these tests had to be reduced to the bare minimum. X-ray test-work was carried out on only two minerals (orthoclase and hornblende) and the corresponding slimes. Kathode-ray tests could be done only on pargasite and the corresponding slime.
page 137 note 4 Hendricks, S. B. and Fry, W. H., Soil Sci., 1930, vol. 29, p. 457;CrossRefGoogle Scholar Kelley, W. P., Dore, W. H., and Brown, S. M., ibid., 1931, vol. 31, p. 25;Google Scholar Nagelschmidt, G., Desai, A. D., and Muir, A., Journ. Agric. Sci., 1940, vol. 30, p. 663.CrossRefGoogle Scholar
page 138 note 1 Analysis of kathode-chamber products showed that a relatively small amount of alumininm did pass through the cellophane partition into the kathode-chamber.
page 143 note 1 Brammall, A., Leech, J. G. C., and Bannister, F. A., Min. Mag., 1937, vol. 24, pp. 507–510.CrossRefGoogle Scholar
page 143 note 2 Bragg, W. H. and Bragg, W. L., X-rays and crystal structure, 1915, p. 14.Google Scholar
page 144 note 1 Chalmers, B.and Quarrell, A. G., The physical examination of metal, 1941, vol. 2, pp. 212–213.Google Scholar
