This book is composed of papers on newborn physiology presented at a symposium held at the State University in Groningen, The Netherlands, under the leadership of Dr. J. H. P. Jonxis. Both the original papers and the discussion by the participants are included. The contributers are international in their origin and outstanding in their professional competence. Although no pretense is made to discuss all the clinical problems of newborn infants, particular subjects are covered in a scholarly and relatively exhaustive manner.