oyne ouer the worke: and by reason of the crokednes, diuers depthes,
and heithes of the way vnder ground, they were in doubt, and at
controuersie, vnder whose ground, as then, the worke was. The name onely
(before this) was of me published, _De Itinere Subterraneo_: The rest,
be at Gods will. For Pioners, Miners, Diggers for Mettalls, Stone, Cole,
and for secrete passages vnder ground, betwene place and place (as this
land hath diuerse) and for other purposes, any man may easily perceaue,
both the great fruite of this Arte, and also in this Arte, the great
aide of Geometrie.

+%Hydragogie%, demonstrateth the possible leading of Water, by Natures
lawe, and by artificiall helpe, from any head (being a Spring, standing,
or running Water) to any other place assigned.+ Long, hath this Arte
bene in vse: and much thereof written: and very marueilous workes
therein, performed: as may yet appeare, in Italy: by the Ruynes
remaining of the Aqueductes. In other places, of Riuers leading through
the Maine land, Nauigable many a Mile. And in other places, of the
marueilous forcinges of Water to Ascend. which all, declare the great
skill, to be required of him, who should in this Arte be perfecte, for
all occasions of waters possible leading. To speake of the allowance of
the Fall, for euery hundred foote: or of the Ventills (if the waters
labour be farre, and great) I neede not: Seing, at hand (about vs) many
expert men can sufficiently testifie, in effecte, the order: though the
Demonstration of the Necessitie thereof, they know not: Nor yet, if they
should be led, vp and downe, and about Mountaines, from the head of the
Spring: and then, a place being assigned: and of them, to be demaunded,
how low or high, that last place is, in respecte of the head, from which
(so crokedly, and vp and downe) they be come: Perhaps, they would not,
or could not, very redily, or nerely assoyle that question. _Geometrie_
therefore, is necessary to _Hydragogie_. Of the sundry wayes to force
water to ascend, eyther by _Tympane_, _Kettell mills_, _Skrue_,
_Ctesibike_, or such like: in _Vitruuius_, _Agricola_, (and other,)
fully, the maner may appeare. And so, thereby, also be most euident, how
the Artes, of _Pneumatithmie_, _Helicosophie_, _Statike_, _Trochilike_,
and _Menadrie_, come to the furniture of this, in Speculation, and to
the Commoditie of the Common Wealth, in practise.

+%Horometrie%, is an Arte Mathematicall, which demonstrateth, how,