(7) On Floating Bodies (Peri okoumenon) is a treatise in two books, the first of which establishes the general principles of hydrostatics, and the second discusses with the greatest completeness the positions of rest and stability of a right segment of a paraboloid of revolution floating in a fluid.
Thus was elaborated the type of despot which attained completeness in Gian Galeazzo Visconti and Lorenzo de Medici.
These vary considerably in completeness with its age; in its younger parts the outer cells wall undergoes the change known as cuticularization, the material being changed both in chemical composition and in physical properties.
Many other cases of symbiosis have been investigated with some completeness, especially those in which lower plants than the Phanerogams are concerned.
The conception of the development of the plan of the earth from the first of cooling of the surface of the planet throughout the long geological periods, the guiding power of environment on the circulation of water and of air, on the distribution of plants and animals, and finally on the movements of man, give to geography a philosophical dignity and a scientific completeness whici it never previously possessed.