THE SCHLUMPF OBSESSION: Inside a Legendary Treasure House, by Denis Jenkinson and Peter Verstappen (Doubleday, $16.95). During the 20 postwar years the Schlumpf brothers assembled a textile empire and one of the world's most fantastic collections of automobiles. In accomplishing both of these goals, the brothers managed to inspire the vitriol of journalists, the hatred of politicians, and the envy of their employees. In 1977, when their empire fell, the Schlumpf brothers, their business affairs in tatters, fled to Switzerland. Their workers seized the factories and the automobile museum and subsequently opened the museum to the public, pending the final disposition of the property by the French courts. The automobile collection is centered around 122 Bugattis, but by no means neglects other makes. By 1977, it numbered 577 cars. The collection was assembled in semi-secrecy, so the public opening of the museum was much anticipated by enthusiasts. Since this book is the first introduction to the collection for many, it is unfortunate that it is not done in a more scholarly fashion. It is written by two writers and an historian, with pictures assembed from 14 sources, so it is inevitable that it has a sort of crazy quilt feeling, and inaccuracies and vagueness have crept into the text. The photographs lack uniformity, and the cars all have a sad, dusty look, but for now it is the last word on the Schlumpf collection.