Summary of the Scientific Principles Illustrated in the Course of our Discussion
Biological Laws.—a. Growth is not only an augmentation in volume, but also an evolution in form.
b. The more essential parts vary less than the accessory parts in the course of their transformations.
The Index.—The index is the mathematical relation between the measurements belonging to the same individual, and as such it gives us an idea of the form; since the form is determined by the relations between the various parts constituting the whole.