The status of knowledge relative to the vibrational assignments, molecular structure, and spectral data for a series of about one hundred silanes has been surveyed and is reported in brief tabular form. A scheme of simplified vibrational modes is discussed, and used to develop the assignment of fundamentals for some fifty five silanes. Some new assignments are proposed in the light of a correlation rule which has been developed. Tables of characteristic frequencies, and the best values for bond distances, based on this work, are presented.