  A translation from Spanish into French of a paper by N. Cuesta published in
1954. The paper deals mainly with partially, and totally, ordered sets. Two
subjects are specially dealt with: Construction of new ordered sets starting
from a family of those. Completion of ordered sets by tools akin to Dedekind
cuts. Curiously enough, the so-called surreal numbers (later defined by Conway,
in 1974) are already there, thirty years before.
