To say merely that he was a photographer is only to brush at the truth. In a career that began in 1867 and was rarely interrupted until his death in 1942 at the age of ninety-nine, William Henry Jackson produced more than forty thousand photographs, most of them of the American West during the last stages of a frontier condition. Throughout most of the last thirty years of the nineteenth century, on both private and government expeditions, Jackson loaded as much as a ton of equipment on the backs of pack animals and struggled across all the rocks and hard places of the West, immortalizing a now almost vanished panorama in crystals of silver nitrate.