The universe of sciences is divided into two great fields:

Physical sciences

Astronomy, mechanics, thermodynamics, chemistry, electricity, magnetism, sciences of the Earth,

Life sciences
Animal and vegetable anatomy and physiology, paleontology, cellular and molecular biology, biochemistry, medicine and pharmacy.

This first distinction is essential because, at least until the beginning of the XIX ^E century, the disciplines of the second category were much less “scientific” that those of the first. In addition , one can note that sciences of the physical world are divided in their turn into two groups rather definitely distinct: physical sciences, with the most common direction, and sciences of the Earth, which is based primarily on the fact that these last were constituted in sciences only tardily - hardly before the XIX ^E century.