Excerpt from Proceedings of the Fourth International Congress for Stereology: Held at the National Bureau of Standards, Gaithersburg, Maryland, U. S. A., September 4-9, 1975 Stereology may be defined as a body of methods for relating the microstructure as seen in the random section or projection plane to the true spatial quanti ties. It means, in a broad sense, the study of structure in three-dimensions. Thus it includes the narrower and more restrictive terms, such as stereometry (measurement in three-dimensions) and morphology (the study of shape). The basic equations of stereology are well-known by now. Consequently, the main efforts of the iss are devoted to advancing stereological theory, solving new problems, improving the efficiency of measurement methods, determining accuracy and error, and contributing to the development of automatic image analysis. The usefulness and the success of the Society depends on its ability to attack these problems on a broad front, whereby the different talents of many people contribute to the solution of the problem. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.