"Experiment is fundamentally only induced observation." (Claude Bernard, "An Introduction to the Study of Experimental Medicine", 1865)
"Observation, then, is what shows facts; experiment is what teaches about facts and gives experience in relation to anything." (Claude Bernard, "An Introduction to the Study of Experimental Medicine", 1865)
"Experiment is the sole source of truth. It alone can teach us something new; it alone can give us certainty." (Henri Poincaré, "Science and Hypothesis", 1902)
"An experiment is an observation that can be repeated, isolated and varied." (Edward B Titchener, "A Text-Book of Psychology", 1909)
"Experiments are like cross-questioning a witness who will tell the truth but not the whole truth." (Alan Gregg, "The Furtherance of Medical Research", 1941)
"An experiment is a question which science poses to Nature, and a measurement is the recording of Nature’s answer." (Max Plank, "The Meaning and Limits of Exact Science", Science, 1949)
"Experimenters are the shocktroops of science." (Max Planck, "Scientific Autobiography, and Other Papers", 1949)
"An experiment is a question which man asks of nature; one result of the observation is an answer which nature yields to man." (Ferdinand Gonseth, "The Primeval Atom", 1950)
"Experiment is the sole judge of scientific ‘truth’." (Richard Feynman, "Six Easy Pieces", 1994)
"One good experiment is worth a thousand models […]; but one good model can make a thousand experiments unnecessary." (David Lloyd & Evgenii I Volkov, "The Ultradian Clock: Timekeeping for Intracelular Dynamics" 2013)
"An Experiment, like every other event which takes place, is a natural phenomenon; but in a Scientific Experiment the circumstances are so arranged that the relations between a particular set of phenomena may be studied to the best advantage." (James C Maxwell)
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