» ZOOPRAXOORAPHY 



purpose of obtaining a regulated succession of photo- 

 graphic exposures is too recent for it to be generally used 

 for scientific experiment or for its advantages to 

 be properly appreciated. At some future time the 

 philosopher will find it indispensable for many of his 

 investigations. ' ' 



The o^reat interest manifested in the results of his 

 preliminary labors convinced the Author that a com- 

 prehensive and systematic investigation with improved 

 mechanical appliances, and newly- discovered chemical 

 manipulations, would demonstrate many novel facts, 

 not only interesting to the casual observer, but of in- 

 disputable value to the Artist and to the Scientist. This 

 investigation and the subsequent publication in the 

 elaborate manner determined upon, assumed such im- 

 posing proportions, and necessarily demanded so large 

 an expenditure, that all publishers, not unnaturally, 

 shrank from entering the unexplored field. 



In this emergency, through the influence of its 

 Provost, Dr. William Pepper, the University of Penn- 

 sylvania with an enlightened exercise of its functions 

 as a contributor to human knowledge, instructed the 

 Author to make, under its auspices, a comprehensive 

 investigation of "Animal Locomotion " in the broadest 

 significance of the words, (see appendix B) and some 

 of the Trustees and friends of the University constituted 

 themselves a committee for the purpose of prqmoting 

 the execution of the work. These gentlemen were Dr. 

 William Pepper, Chas. C. Harrison, J. B. Lippincott, 

 Edw. H. Coates, Samuel Dickson and Thomas Hockley. 



The Author acknowledges his obligations to these 

 gentlemen for the interest they took in his labors; for 



