  This is the LaTeX version of the handwritten notes of a lecture at the Kyoto
Singularities Symposium held at the RIMS in April 1978. It presents the
relationship of various invariants of isolated singularities of complex
analytic hypersurfaces with the jacobian Newton polygon built from the polar
curves. An appendix presents features of the semiring of Newton polygons,
because the product of Jacobian Newton polygons corresponds to the
Thom-Sebastiani sum of hypersurfaces. Analogies between mixed multiplicities
and mixed volumes are noticed. They have been explained since.
