Ballantine, W. G. (1933). Facts of resemblance. In W. G. Ballantine, The logic of science (pp. 71-78). New York, NY, US: Thomas Y Crowell Co.
http://dx.doi.org/10.1037/13334-007
The earliest mental activities of the infant must be in observing single facts. But there is one recurring fact of relation which must soon force itself upon his attention; this is the resemblance between many of these single facts. As we say in popular language, the same phenomenon is repeated. The word same, thus used, merely means that a resembling phenomenon comes. Meeting a multitude of similar phenomena, the mind at length forms a general concept and finally invents a common noun, as man or tree. The existence of such words depends on the fact of the existence of numbers of objects recognized by the mind as similar. (PsycINFO Database Record (c) 2016 APA, all rights reserved)