Partons and their applications at high energies (Reprinted from Annals of Physics, vol 66, pg 578-623, 1971)

This paper is dedicated to the memory of Amos de-Shalit with deep sadness a t the loss. not only of a very distinguished and important scientific colle ague but also of a very close personal friend whose gentleness was matched only by his wisdom. In his tragically brief life by persistently strove to bridge the growing gulfs between different scientific disciplines as also b etween different cultures and nations. Of special physical interest to him was the unity of concepts in nuclear and particle physics an example of whi ch is presented here in the form of the impulse approximation. S.D.D.