This database would be informative for students studying the history of particular psychological concepts. Based on my research interests, I entered the words [animal magnetism, Mesmerism, hypnotism, hypnosis], and with a little tweaking of dates and smoothing found interesting usage trends. http://ngrams.googlelabs.com/graph?content=animal+magnetism%2CMesmerism%2Chypnotism%2Chypnosis&year_start=1780&year_end=2000&corpus=0&smoothing=10 -Max
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