Previous experiments had left open the possibility that the melting phenomena of the methyl siloxanes might be an exception to the universal behavior of all other known substances, namely, that there is no experimental evidence for a critical point between solid and liquid or for a maximum or temperature asymptote on the melting curve. The special apparatus necessary for an examination of the siloxanes in this respect has been constructed, and it has been found that they do not constitute any exception. The abnormality of their melting behavior is sufficiently explained by abnormal subcooling effects connected with the abnormally large increase of viscosity of these substances under pressure.
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