s a
| | necessary consequence that the propositions of geometry cannot be derived
| | from general notions of magnitude, but that the properties which distinguish
| | space from other conceivable triply extended magnitudes are only to be deduced
| | from experience.  Thus arises the problem, to discover the simplest matters of
| | fact from which the measure-relations of space may be determined;  a problem
| | which from the nature of the case is not completely determinate, since there
| | may be several sy