Since no adequate text has as yet been written on "growth and development," the author is to be commended for his work on the most important phase of this period. In fact, and as the author admits, his text extends backward to include the entire period of growth in many instances.
The importance of accurate interpretation of growth data is discussed. There is no question but that data of the longitudinal type gives the only real and accurate picture on growth findings, inasmuch as it will show the direction of growth.
Every muscular and skeletal dimension seems to take part in the adolescent spurt. The trend of these changes is depicted in graphic form. From the reproductive standpoint, the development of the penis, testes, uterus, ovaries, and prostate during adolescence is spectacular in its rapidity. This is well illustrated.
In discussing factors affecting the time and character of the adolescent