When many polymers are heated they transform directly into carbons, without passing through an intermediate liquid paste. Such carbons are termed polymetric carbons. Phenolic resins yield an isotropic impervious black glassy carbon which is hard enough to scratch window glass and has interesting electronic properties. polyacrylonitrile fibres yield carbon fibre with enormous stiffness and strength. Combinations of the two produce the strongest carbon material (carbon-fibre-reinforced carbon). Carbon-fibre-reinforced plastics are revolutionary low density-high-stiffness materials. This 1976 book brings together data from the authors' work to describe the manufacture of polymetric carbons. It provides a description of physical, mechanical and chemical properties which are related as closely as possible to the revealed structure. Emphasis is placed on the more interesting aspects, such as development of high-strength, high-stiffness material, the semi-conducting behaviour of intermediate materials and the absorption of gases in the more open structure of absorbent chracoals.

In recent years the inferior olive and its projection to the cerebellum have attracted considerable interest. Numerous experimental anatomic and electrophysiologic studies have been undertaken, and much new information has been brought forward. Many apparently discordant observations have been reported however, and on many points the data obtained by the use of different methbds and approaches appear to be diffi cult to reconcile. Much of the interest in the olivocerebellar projection concerns the topographical localization within the projection. Particularly as a result of research in recent years the pattern of localization has turned out to be far more complex than previously be lieved. It was found useful, therefore, to attempt a review of the subject in the hope that a critical analysis of available observations might make it possible to obtain an integrated picture of the olivocerebellar projection and perhaps fmd some basic principles in the organization of this fiber system. As will be seen, our attempt has been only partly successful. There are still riddles that remain to be solved. In the present review attention will be focused on problems related to the locali zation within the olivocerebellar projection, particularly its anatomic aspects. An extensive review of the physiology of the inferior olive has been published recently by Armstrong (1974), who considers some anatomicophysiologic correlations as well. Physiologic fmdings will be referred to here mainly in relation to our main theme."