Abstract: | As M. Belbenoit's contribution was much lengthier than the articles normally accepted for the “revue ATEE journal”, the Editorial Secretariat were at first inclined to try to condense it. We found, however, that condensation would not allow a fair representation of the author's views, and so decided to publish it in two instalments, of which the first in the preceeding issue (p. 127‐150). This is the second instalment. |