In every piece of experimental work two steps seem to be necessary. The first is the development of an appropriate method for studying the problem; the second is the actual study.
The variability of technic reported in the literature often makes it difficult to determine for any given problem the method which takes into full consideration the present accumulation of facts and theories. This seems to be particularly true for the study of reflexes. The flood of papers describing single reflex responses has reached a point at which it is difficult to keep track of fundamental principles.
In this paper, I attempt to attack the study of plantar stimulation in infancy in the two ways described. The first part deals with the analysis of the observations contained in the English, French and German literature for the purpose of setting up a method of studying the response to plantar stimulation. The