Descriptive zoopraxography; or, the science of animal locomotion made popular : with selected outline tracings reduced from some of the illustrations of 'Animal Locomotion' an electro-photographic investigation of consecutive phases of animal movements, commenced 1872, completed 1855, and published, 1887, under the auspices of the University of Pennsylvania. Published as a memento of a series of lectures given by the author under the auspices of the United States Government Bureau of Education at the World's Columbian Exposition, in Zoopraxographical Hall 1893 /