ies all the Trees impetuously to _Idria_, where the Bridge is built
very strong, and at very oblique Angles to the stream, on purpose to stop
them, and throw them on shore neer the Mines. {25}

Those Mines cost the _Emperour_ heretofore 70000. or 80000. _Florens_
yearly, and yielded less _Mercury_ than at present, although it costs him
but 28000. _Florens_ now. You may see what his Imperial Majesty gets by the
following account, of what _Mercury_ the Mines of _Idria_ have produced
these last three years.

1661. l.
Ordinary _Mercury_ 198481
Virgin _Mercury_ 6194
--------
204675
--------

1662. l.
Ordinary _Mercury_ 225066
Virgin _Mercury_ 9612
--------
234678
--------

1663. l.
Ordinary _Mercury_ 244119
Virgin _Mercury_ 11862
--------
255981
--------

There are alwaies at work 280 persons, according to the relation I received
from a very civil person, who informed me also of all the other particulars
above mentioned, whose name is _Achatio Kappenjagger_; his Office,
_Contra-scrivano per sua Maesta Cesarea in Idria del Mercurio_.

To give some light to this Narrative, take this Diagramme: F. is the water,
C. B. a vessel, into which it runs. DG. EH. FI. are streams perpetually
issuing from that vessel; D. E. F. three sives, the distance of whose wires
at bottom lessen proportionably. G. the place, wherein the Earth, that
pass'd through the sive D. is retained; from whence 'tis taken by the
second man; and what passes through the sive E. is retained in H. and so of
the rest. K. L. M. wast water, which is so much impregnated with _Mercury_,
that it cureth Itches and sordid Ulcers. See Fig. 1.

[Illustration]

I will trespass a little more upon you, in describing the contrivance of
blowing the Fire in the _Brassworks_ of _Tivoli_ neer _Rome_ (it being new
to me) where the Water blows the Fire, not by moving the Bellows, (which is
common) but by affording the Wind. See Fig. II. Where A. is the {26} River,
B. the Fall of it, C. the Tub into which it falls, LG. a Pipe, G. the
orifice of the Pipe, or Nose of the Bellows, GK. the Hearth, E. a hole in
the Pipe, F. a stopper to that hole, D.