Group of 3 offprints. Includes: AUSTIN. "The Killing Substance, Paramecin: Activity of Single Particles." Offprint from: American Naturalist, vol. LXXXII, [ca. 1947.

No place:: American Naturalist, 1947., 1947. 8vo. 51-59 pp. Self wraps. Ownership rubber stamp of Norman Horowitz, California Institute of Technology. Fine. WITH: AUSTIN: "Sensitivity to Paramecin in Paramecum Aurelia in Relation to Stock, Serotype, and Mating Type." Offprint from: Physiological Zoology, vol. XXIV, no. 3, 1951. 8vo. 196-204 pp. Self wraps. Ownership rubber stamp of Norman Horowitz. Fine. WITH: AUSTIN: "The Killing Action and Rate of Production of Single Particles of Paramecin 51." Offprint from: Physiological Zoology, vol. XXI, no. 1, 1948. 8vo. 69-86 pp. Self wraps. Ownership rubber stamp of Norman Horowitz. Fine. Mary L. Austin was with the Dept. of Zoology, Wellesley College.