Partons and Their Applications at High Energies* Sidney D. Drell and Tung-mow Yan+

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