This history of aerodynamic research will prove extremely interesting to the ""advanced amateur"" in aviation, as well as to the pilot, technician and engineer. Centered around the work of the National Advisory Committee for Aeronautics, it gives the inside story of progress in aerodynamics, engines, and technical design, told with an original approach. Where the ordinary book or article on aviation describes the finished product, a faster airplane, a more powerful engine, here the story is told the other way round, as it really happened. The needs are stated by Army Air; skilled teams of engineers, inventors, pilots set out to fill the bill. We hesitate to pick flaws in such a swell job, but there are several. The treatment is uneven,- on the one hand some rather advanced concepts are treated lightly with an ""everybody knows this"" attitude, while several obvious, primary level topics are elaborately explained. The price makes it out of reach for the young people who would most profit by it- boys who have graduated from advanced model-building into beginnings of design and engineering. Nevertheless, it is a swell job and a Must for High Schools, colleges, P.L.'s.