lst dilution,—One hundredth of a drop or grain.
2d “ One ten thousandth.
3d “ One millionth, marked I.
4th “ One hundred millionth.
5th “ One ten thousand millionth.
6th “ One million millionth, or one billionth, marked II.
7th “ One hundred billionth.
8th “ One ten thousand billionth.
9th “ One million billionth, or one trillionth, marked III.
10th “ One hundred trillionth.