John Weeks Moore, Complete Encyclopaedia of Music… (1880)
“ An appoggiatura is a note of decoration. In slow movements, its chief office is to soften and-smooth the effect of certain distances, and, by dwelling upon a note of any chord, to retard the completion of the subsequent harmony. In bold, energetic, and voluble movements, a chain of appoggiature not only serves to link the greater intervals, but affords the singer, or player, full scope for the display of flexibility in voice or finger, and for the employment of intonation and impassioned expression. ”
