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From crystallographical data it is always known how the face of a cube is situated in any given regular crystal, and there is consequently no difficulty in fixing the crystal on the spectrometer table in such a way that the reflection shall take place by planes with any prescribed orientation.
The relation between sterols and oestrogenic substances which had been assumed on crystallographical grounds became probable from the chemical point of view only after Butenandt and
His reports about different crystallographical instruments, as well as those regarding the production of thin sections of crystals for microscopic study, are important for the science of crystallography.
The latter possesses a crystallographical collection of 1024 wooden models which formerly belonged to the Abbé
As it must be assumed, on the strength of the analogy of these salts, both in a chemical and a crystallographical sense, that they are possessed of a corresponding space lattice, which could also be corroborated in another way, it was proved by those researchers that the lattice of the crystals in question consists of two face-centred cubic lattices corresponding to the two atoms, which interpenetrate in such a way that they together constitute one single cubic lattice.