Physics and Astronomy

It has been a great pleasure for me to see this book - very often several copies - in almost every low-temperature laboratory I have visited during the past three years. Low- and ultralow-temperature physics continue to be lively and pro­ gressing fields of research. New results have emerged over the four years since publication of the first edition of my monograph. The second edition contains relevant results particularly on thermometry and materials proper­ ties, as well as many additional references. Of course, typographical errors I had overlooked are now corrected. I am grateful to J. Friebel for checking and solving the problems I have included in this new edition. And, as for the case of the first edition, I again thank H. Lotsch for the very careful edit­ ing. I hope that this lower-priced paperback edition will continue to be a valuable source for the research and study of many of my colleagues and their students.