106. Michael Economos. Gesticulating Roots, 1960. Pen and ink with wash. 107. Student drawing. Organic Root Forms. Pen and ink. 108. Frederic Felton. Writhing Branches, 1959. Pen and ink. 109. Asher Derman. Three Studies of Roots, 1957. Pen and ink. 110. Michael Mazur. Reciprocal Pressures, 1960. Wash. 111. John Cohen. Roots in Tension, 1954. Brush and ink. 112. Louis Klein. Postures of Roots, 1959. Pen and ink. All drawings are from the Collection of Yale University, New Haven Conn.