Lotze on Comparison and the Unity of Consciousness

Hermann Lotze argued that the fact that consciousness simultaneously "holds objects together as well as apart" such that they can be compared implies (a) that there is a simple thinker and (b) that consciousness is an 'indivisible unity.' I offer a reconstruction and evaluation of Lotze's Argument from Comparison. I contend that it does not deliver (a) but makes a good case for (b). I will relate Lotze's argument to the contemporary debate between "top-down" and "bottom-up" views of the unity of consciousness and locate it in its historical context. (Kant and Herbart figure prominently here.)