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Kinetics of Nitrogen Formation from Nitrous Acid and Ammonium Ion 1449 tion in these systems as substitutional. The lattice of the smaller atoms must expand to accommodate the larger atoms whereas smaller atoms can be substituted in the lattice of the larger atoms without affecting the lattice constants appreciably. Whether or not lattice contraction occurs upon initial substitution of smaller atoms certainly must depend on interatomic forces operative in the crystal. It is significant that in the calcium-strontium system at room temperature substitution of calcium atoms in the lattice of the larger strontium atoms is accompanied by a linear lattice contraction whereas at higher temperatures, where interatomic attractions are partially overcome by thermal agitation, the lattice fails to contract proportionately.