If the answers to your questions sound vague, ask for clarification.
A partial clarification was suggested in 1787 by J.
This spontaneous clarification was at one time the only method in vogue.
Clarification of concepts which are wholly abstract, so that they are not merely not ultimate realities, but also in no sense actual moments of our concrete thinking.
As such strainers were further improved, by sorting the sand and gravel, and using the fine sand only at the surface, better clarification of the water was obtained; but chemical analysis indicated, or was at the time thought to indicate, that that improvement was practically confined to clarification, as the dissolved impurities in the water were certainly very little changed.