As written in the Foreword by the author, the monograph can be considered the beginning of a comprehensive book on the value of roentgenkymography. The book shall be a further development of the work Bewegungslehre innerer Organe published in 1936 by Stumpf, Weber and Weltz. An experience of 25 years gives to the author the possibility to lend to the practitioner the outlines of the method and some useful advice for the daily routine work.