It remains to call attention to the chief outstanding difficulty of our subject [turbulent motion].


Hydrodynamics, Chapter VI, section 365 (p. 663)


It remains to call attention to the chief outstanding difficulty of our subject [turbulent motion].

It remains to call attention to the chief outstanding difficulty of our subject [turbulent motion].

It remains to call attention to the chief outstanding difficulty of our subject [turbulent motion].

It remains to call attention to the chief outstanding difficulty of our subject [turbulent motion].