This is a detailed study of children of preschool age (from 2 to 6 years) in Argentina for the years 1930 to 1933. The statistics for both the morbidity and the mortality are given and are further divided into statistics on the various causes, on sex and on age incidence. Although the book is in Spanish, the tables and graphs are so clear that any one can easily read them. Much work has been put into this study, and the form and material give ample evidence of this. It is an excellent work for any one interested in this branch of pediatrics, and it is gratifying to see that pediatricians of other countries are taking an interest in the child of preschool age.