 The Hermeneutic Circle objection was prefaced on the claim that what counts as observable is, according to the constructive empiricist, determined by scientific theory. Another worry based on that presupposition, raised by Alspector-Kelly (2004), is that scientific theory determines much more to be observable than the constructive empiricist typically allows. On Alspector-Kelly’s view, we should countenance as observable whatever science says we can have reliable information about on the basis of perceptual experience, and science says we can have reliable information about what is perceptually revealed to us via microscopes.