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Product names which are in fact registered trademarks h a v e n o t been specif ically designated as such. Thus, in those cases where a product has been referred to by its registered trademark it cannot be concluded that the name used is public domain. The same applies as regards patents or registered designs. Al l rights reserved . No part of this book m a y be reproduced in any form (by photostat , microfilm or any other means) without writ ten permission of the publisher. © Georg Thieme Ver lag , Stuttgart 1969. — Printed in Germany by Darmstadter Echo, Ver lag und Druckerei GmbH, Darmstadt. For Georg Thieme V e r l a g : Order number 4535. For Academic Press: Library of Congress catalog card number 70-1038&7.