In the first part, the author recalls the principal phenomena concerning the flow of the viscous liquids about an immersed body when the Reynolds numbers are progressively increased. The following factors in order have been studied in the Laboratory of Hydraulics of Toulouse.1. Curves (C. CAMICHEL ANDP. DUPIN);2. Pressures about a Submerged Body for Small Reynolds Numbers (E. CRAUSSE ANDJ. BAUBIAC);3. Similitude of the Limiting Layer for Small Reynolds Numbers (L. ESCANDE ANDM. TEISSIESOLIER);4. Anomalies Shown by Colloids for Small Reynolds Numbers (M. PICHOT ANDP. DUPIN);5. Alternating Vortices of Bénard‐Karman (P. DUPIN);6. Secondary Vortices (E. CRAUSSE ANDJ. BAUBIAC);7. Surfaces of Discontinuity (L. ESCANDE ANDM. TEISSIESOLIER);8. Varying Modes of Contraction of Jets at the Entrance of a Nozzle (C. CAMICHEL ANDP. DUPIN);9. Determination of the Vector Vortex at a Determined Work Value for Different Values of the Reynolds Number (C. CAMICHEL ANDP. DUPIN);10. Viscosity of a Liquid Containing Solid Particles in Suspension (J. LHOMME).