⚠The page is heavily foxed and stained, with significant brown spotting throughout.

Anthropology 36 pm (1.2 This appears to be a library shelfmark or archival cataloging number added to the manuscript.

ELEMENTS OF PSYCHOPHYSICS.

FIRST PART.

.229 G An archival reference or inventory number.

PsychophysicsA term coined by Fechner to describe the exact science of the functional relationship between the mind and the body—specifically, the mathematical connection between physical stimuli (like light or sound) and the internal sensations they produce.