“Microeconomics, including the study of individual choice and of group choice in market and nonmarket processes, has generally been considered a field science as distinct from an experimental science. Hence microeconomics has sometimes been classified as "non-experimental" and closer methodologically to meteorology and astronomy than to physics and experimental psychology (Marschak, 1950, p. 3; Samuelson, 1973, p. 7). But the question of using experimental or nonexperimental techniques is largely a matter of cost, and generally the cost of conducting the most ambitious and informative experiments in astronomy, meteorology, and economics varies from prohibitive down to considerable. The cost of experimenting with different solar system planetary arrangements, different atmospheric conditions, and different national unemployment rates, each under suitable controls, must be regarded as prohibitive.”

W. Allen Wallis (1952) at the University of Chicago while honoring Fisher with the Honorary degree of Doctor of Science; cited in: George E. P. Box (1976) " Science and Statistics http://www-sop.inria.fr/members/Ian.Jermyn/philosophy/writings/Boxonmaths.pdf" Journal of the American Statistical Association, Vol. 71, No. 356. (Dec., 1976), pp. 791-799.

Introduction to Astronomy and Cosmology (2008), Ch. 1 : Astronomy, an Observational Science

Introduction à l'Étude de la Médecine Expérimentale (1865)

Dissent, New State Ice Co. v. Liebmann, 285 U.S. 262 (1932).
Judicial opinions

Great Books: The Foundation of a Liberal Education (1954)

Aphorism 95
Novum Organum (1620), Book I
Context: Those who have handled sciences have been either men of experiment or men of dogmas. The men of experiment are like the ant, they only collect and use; the reasoners resemble spiders, who make cobwebs out of their own substance. But the bee takes a middle course: it gathers its material from the flowers of the garden and of the field, but transforms and digests it by a power of its own. Not unlike this is the true business of philosophy; for it neither relies solely or chiefly on the powers of the mind, nor does it take the matter which it gathers from natural history and mechanical experiments and lay it up in the memory whole, as it finds it, but lays it up in the understanding altered and digested. Therefore from a closer and purer league between these two faculties, the experimental and the rational (such as has never yet been made), much may be hoped.

Great Books: The Foundation of a Liberal Education (1954)

at the AAAS meeting: Mathematics and Science of Origami: Visualize the Possibilities, February 15, 2002, as quoted by Science Daily Origami Helps Scientists Solve Problems http://www.sciencedaily.com/releases/2002/02/020219080203.htm, February 21, 2002.

Source: Reinventing Gravity (2008), Chapter 8, Strings And Quantum Gravity, p. 136