Exploration of the data on the character of the ownership of manufacturing establishments presented in the 1900 Census volumes has revealed some challenging phenomena. Buried in this material, for example, is the somewhat unexpected information that the corporation was used extensively in manufacturing establishments in such localities as Arizona, Nevada, Washington, and California, but to a much smaller degree in places like New York, Pennsylvania, and Maryland, where by 1900 the corporation might be assumed to have become well established as a form of business organization.