Stanford maintained a friendly interest in Muybridge because he had become increasingly interested in the problem of the movements of a horse in fast action and he wished to obtain evidence to confirm the new theory of animal locomotion which had been developed chiefly by Marey in France. Stanford was primarily interested in the running gaits of horses and other movements secondarily. The stories of what really happened in 1877 are not identical. Muybridge said in 1883 at a lecture at the Franklin Institute in Philadelphia, “Being much interested with the experiments of Professor Marey... I invented a method of employing a number of cameras .... I explained my intended experiments to a wealthy resident of San Francisco, Mr. Stanford, who liberally agreed to place the resources of his stock breeding farm at my disposal and to reimburse the expenses of my investigation, upon the condition of my supplying him, for his private use, with a few copies of the contemplated results.” On the mere statement, Muybridge’s position is subject to serious question. It certainly is unlikely that Stanford would pay all expenses just to obtain a few copies of the “intended results for private use.” The ownership of the results was subject to considerable dispute. Stanford copyrighted the pictures in 1881 and had them published in a book edited by Dr. J. D. B. Stillman, entitled _The Horse in Motion_. In that book the story is that when Muybridge returned to San Francisco in 1877, he was engaged to continue the experiments by Stanford. According to Stillman, in 1877 pictures were taken of one of Stanford’s horses, with a single camera and “one of these, representing him with all his feet clear of the ground, was enlarged, retouched and distributed to the parties interested.” This then was just another effort to obtain a good, sharp, fast, single picture of action. John D. Isaacs, later chief engineer for the Harriman Railroad System, had designed and supervised all the installation of the battery camera apparatus. His name was suggested to Stanford by Arthur Brown, then chief engineer of maintenance of the Central Pacific, one of Stanford’s interests. Isaacs was a young man fresh from the University of Virginia, where he had graduated in 1875. He was an amateur photographer and very familiar with Marey’s work and that of the photographers in France and England and in the eastern part of the United States. In 1878 further efforts were made at Stanford’s private track at Palo Alto, where the battery system of cameras was introduced and good results obtained. Each camera in the battery was equipped with a fast-acting shutter and was set off successively by a mechanical-electrical device. (Illustration on opposite page.)