80

25. _By whom used?_
The ancient Romans.

26. _What is the Numerical value of S?_
7

27. _By whom used?_
The Ancients.

28. _Give the values of T as a Numeral._
300 in the Greek notation; in the Latin, 160.

29. _What is the Numerical value of V?_
5 in the Roman notation.

30. _What are the values of X as a Numeral?_
In the Roman, 10; in the Greek, 60.

31. _What are the Numerical values of Z?_
7 in the Greek notation; and 2,000 in the Roman.

32. _Why have J, U, W, and Y no Numerical values?_
Because they have been introduced into the Alphabet since the
Science of Arithmetical Notation was invented.

33. _What effect does it have on the value of a letter to draw a
line above it?_
In most cases it increases its value a thousand times.