Leonardo, making use of fractions of the **sexagesimal** scale, gives X = I° 221 7 42" i 33 iv 4v 40 vi, after having demonstrated, by a discussion founded on the 10th book of Euclid, that a solution by square roots is impossible.

The Babylonian system was **sexagesimal**, thus (18) --

This whole class seems to cling to sites of Phoenician trade, and to keep clear of Greece and the north -- perhaps a Phoenician form of the 129 system, avoiding the **sexagesimal** multiples.

- The Egyptian notation was purely denary, the only separate signs being those for 1, io, too, &c. The ordinary notation of the Babylonians was denary, but they also used a **sexagesimal** scale, i.e.

The Babylonians adopted 60 for both these purposes, thus giving us the **sexagesimal** division of angles and of time.

The Greeks originally used unit-fractions, like the Egyptians; later they introduced the **sexagesimal** fractions of the Babylonians, extending the system to four or more successive subdivisions of the unit representing a degree.

In the **sexagesimal** system the numerators of the successive fractions (the denominators of which were the successive powers of 60) were followed by', ", "', ", the denominator not being written.

There was, however, no development in the direction of decimals in the modern sense, and the Arabs, by whom the Hindu notation of integers was brought to Europe, mainly used the **sexagesimal** division in the ' " "' notation.

Even where the decimal notation would seem to arise naturally, as in the case of approximate extraction of a square root, the portion which might have been expressed as a decimal was converted into **sexagesimal** fractions.