The heart of modern chemistry is the correlation of the properties of substances with the structures of the atoms, molecules, ions, and crystals of which the substances are composed. As chemists have learned more and more concerning the structure of matter and the manner in which the structures of materials determine their properties, the science of chemistry has correspondingly moved steadily from the empiricism of a new and immature discipline toward the deductive character of a well-developed and mature science. For this reason and because of the excellence of Professor Ryschke-witsch's treatment of the subject, we are pleased to present "Chemical Bonding and the Geometry of Molecules" as an important addition to our series Selected Topics in Modern Chemistry.