NOTE. 7 



portion of it to critical examination. As, however, the sole ob- 

 ject which induced the University to assume supervision of this 

 work was to contribute to the scientific study of animal motions, 

 it has been decided to publish in the present form a brief descrip- 

 tion by Professor W. D. Marks, Whitney Professor of Dvnam- 

 ical Engineering in the University of Pennsylvania, of the appa- 

 ratus and methods employed; a memoir by Dr. Harrison Allen, 

 Emeritus Professor of Physiology in the University of Pennsyl- 

 vania, on some of the laws or principles elucidated by Mr. Muy- 

 bridge's photographs; and an article on the clinical aspects of 

 certain nerv^ous affections as illustrated by instantaneous photog- 

 raphy, by Dr. F. X. Dercura, Instructor in Nervous Diseases in 

 the University of Pennsylvania. 



William Peppee, Provost. 



