Proceedings American Philosophical Society Vol 117 No 1 1973

Astronomy and Astrophysics Abstracts, which has appeared in semi-annual volumes since 1969, is de voted to the recording, summarizing and indexing of astronomical publications throughout the world. It is prepared under the auspices of the International Astronomical Union (according to a resolution adopted at the 14th General Assembly in 1970). Astronomy and Astrophysics Abstracts aims to present a comprehensive documentation of literature in all fields of astronomy and astrophysics. Every effort will be made to ensure that the average time interval between the date of receipt of the original literature and publication of the abstracts will not exceed eight months. This time interval is near to that achieved by monthly abstracting journals, com pared to which our system of accumulating abstracts for about six months offers the advantage of greater convenience for the user. Volume II contains literature published in 1974 and received before August IS, 1974; some older literature which was received late and which is not recorded in earlier volumes is also included. Begin ning with this volume some minor changes of our classification scheme have been made. We acknowledge with thanks contributions to this volume by Dr. J. BouSka, who surveyed journals and publications in the Czech language and supplied us with abstracts in English, and by the Common wealth Scientific and Industrial Research Organization (C.S.I.R.O.), Sydney, for providing titles and abstracts of papers on radio astronomy.

The central assumption of The Textbook as Discourse is this: interpreted in the flow of history, textbooks can provide important insights into the nature and meaning of a culture and the social and political discourses in which it is engaged. This book is about the social, political and cultural content of elementary and secondary textbooks in American education. It focuses on the nature of the discourses—the content and context—that represent what is included in textbooks. The term "discourse" provides the conceptual framework for the book, drawing on the work of the French social theorist Michel Foucault. The volume includes classic articles and book chapters as well as three original chapters written by the editors. To enhance its usefulness as a course text, each chapter includes an Overview, Key Concepts, and Questions for Reflection.