Review of the Relation of Density and Refractive Index to the Composition of Glass: I *

A bstract The density, refractive index, and specific refractivity and their relationship to the composition of glass are discussed. The subject is treated from the standpoint of additive properties based on composition both as to linear and collective or complex functions. Not only are these applied in the rapid checking of constancy of composition in practice but also from the standpoint of possible changes in properties through partial changes of individual components. There is the further possibility of tying up constitution with composition so that a structural analysis may result. The article serves as a review of existing literature and elaborates the possibility of expansion of published data.