Abstract
This law, proposed by Bravais on speculative grounds, only received general acceptance after Georges Friedel (1904, 1905, 1907) proved it to be substantiated by observation. With certain restrictions the law states that, for any crystalline species, a translation lattice can be found such that: (1) The observed crystal faces are parallel to the net planes with the highest reticular densities (or smallest mesh areas); (2) the greater the reticular density (or the smaller the mesh area) the more important the corresponding form.
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