Volume II focuses on hydrodynamics, bifurcation theory and algebraic geometry. Arnold was a very prolific writer. The publication of his collected works is a huge task and a great service to the mathematical community particularly since his papers appeared in various journals some of which are not easily accessible. I have no doubt that these volumes will be of great benefit to the current and future generations of researchers and graduate students. (Gerard Misioek, zbMATH 1354.01038, 2017)