The present volume contains the proceedings of the Ciba Foundation Symposium on the nature of sleep. Eighteen individual reports of various investigators have been assembled in this work under the chairmanship of Sir John Eccles, whose comments open and close the volume. The contributors to this volume are among the most distinguished members of the science of neurophysiology and include C. G. Phillips, Frederic Bremer, Moruzzi, Dell, and Bonvallet and Gastaut.
The great majority of investigators have based their reports on the electroencephalographic changes which accompany sleep and its alterations. It is of especial interest and importance that not only has use been made of the clinical electroencephalogram, but also of single unit recordings from the cortex of experimental animals and steady-state or DC recordings.
Of special interest is the electroencephalographic and polygraphic study of sleep in the human adult by Fischgold and Schwartz of Paris. The correlation between electroencephalographic