and like a Vault, which is likewift to be coimter-walled and 
counter-vaulted with clay between. This T^alled fqnare Cavity 
is tobe piercedby fix or feven Metalline pipes, ' which ffiall be 
as big as t hofe of Canons, and have their Orifices from \\ ithout ; 
thereby to receive the water of theMagazin to the, height of the 
Gallery. The Cocks are to be within, Ihut up in the little fpace 
that the faid Cavity is to contain, for to caft the water down fo 
as it may have a fall pf four Thele Cocks fball be 
open d through a window that is at the end of the Gallery. And 
there is to be yet another little aperture beneath, at whichone 
ijnaydefcend into this Chamber, in cafe the paflage of the water 
fliall be inconibred, or that any other inconvenience is to be 
remedied. For which purpofe there fhall be faftned eight bars 
of Iron inthe WaUs, like a kind of ftairs, for the conveniency of 
thofe that fliall go down. 
This Gallery is on'y to ferve for pafTingto open the Cocks, 
according as there ftiall be need of water : And the water falling 
down will tind iflue through the Aqueduft , following the bed 
of the ri volet ^/udot , falling into the Deriving Channel below 
the Yilhge Faudreul. 
It was neceflary to place thefe Pipes fo, as that they might noc 
take the v^'ater but at about four fathoms high from the ground^ 
becaufe 'tis not poffible to make fuch a great colleftion of waters 
in this Confervatory, efpecially of fuch waters as come, in part, 
from Snows and Rains, without ftore of dirt, fand, iiones,pieces 
of wood, from the neighbouring Forefts; and therefore there 
was an abfolute neceffity to leave fome fpace for all thisftufFy 
to prevent obftnidting or fpoiling the Pipes.On whichoccafian it 
is to be added, that forafluuch as in length of time thls'dirt may 
be heaped up to fuch a height, as to flop up the Pipes ; to avoid 
this inconvemerice , there hath been made in the faid fquare 
Cavity an Opening below, anfwering to the Aquedu<9: ; which 
Opening is to be commonly fliar by a great Iron-gate , that can 
Mdrawntip, or opened at p.^eafiire from the Gallery that 
the water finding this vent, and forcibly iffiiihg^ may carry with 
it atl the dirt , or other fluf that lhall be gathered at the bottom 
of thisStore-fioufi^ 
. ' This. 
