ON PHOTOGRAPHY by Susan Sontag; Farrar, Straus & Giroux; 207 pages; $7,95
"The best writing on photography,"Susan Sontag declares, "has been by moralists Marxists or would-be Marxists hooked on photographs but troubled by the way photography inexorably beautifies." The category includes its maker.
There are perhaps half a dozen critics in America whose silence would be a loss to writing itself, and Sontag is one of them. On Photography is not a history of photography. Nor is it a book about photographers. Instead, as the title declares, Sontag has elected to write a meditation on the medium itself.
Her timing is...