A note on extensions
"Thoughts pass from one individual to another, each time a little transformed…" (Fleck 1935, 57)
Fleck, Ludwick. 1935. "Genesis and Origin of a Scientific Fact," pp. 56-59 in Hechter, Michael and Christine Horne 2009, Theories of Social Order: A Reader (second edition). Stanford, CA: Stanford University Press.