This study comprises observations made on 1,000 children, aged 1 to 18 years, between 1936 to 1939. Dr. Widdowson is well qualified from her previous chemical and analytic studies, which date back to 1925. The study presents many interesting facts, and one is impressed with their careful and thorough analysis. Among the most striking revelations were the rather wide variations in caloric intake which were compatible with good health and average physical development. To the American reader the chapter on "beverages" is of interest. She notes that the "small beer" which for centuries was the customary drink of children has been replaced by tea and also to some extent by milk, the average amount of milk being less than a pint a day. This book will be valuable and instructive for any one interested in nutrition and development in childhood.