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P late 7. Pig. V. Section of an ordinary white chlorate crystal chosen at random, under polarised light, X360 diameters. Note the two isolated twin strata. Pig. YI. Section of a portion of the above (No. Y) after heating to above 250° C. Note the complex twin structure produced. X 360 diameters. Pig. YII. Spectrum of the reflexion from No. YI.doi:10.1098/rspa.1923.0025 fatcat:yb336r62wzhcdb3sgtlpe5c4gi