TRANSLATOR'S NOTE 



Instantaneous photography, especially that branch 

 of it known as Chronophotography, has already won 

 for itself a recognized position among the methods 

 of scientific research, and in the near future it is 

 probable that it will be even more generally appre- 

 ciated. Marey and Muybridge must undoubtedly be 

 regarded as the two pioneers of the method ; the 

 works of the latter, written in English and published 

 in America, are within the reach of all who can read 

 the English language ; on the other hand, the works 

 of Marey are for the most part inaccessible to those 

 who are unfamiliar with French. It is for this reason 

 that I applied for and obtained permission to translate 

 this work. 



" Le lEouvement " is one of the most recent and 

 important publications of this eminent physicist and 

 physiologist, and it is, I believe, the most compre- 

 hensive summary hitherto published, of the results 

 and possibilities of instantaneous photography ; every 

 page has its interest not only for the specialist, but 

 also for the general reader ; and further, the book is 

 replete with suggestiveness of new lines of research. 



Chronophotography is a new subject, and many of 



