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. 1662. l. 1663. l.
Ordinary Mercury 198481 Ordinary Mercury 225066 Ordinary Mercury 244119
Virgin Mercury 6194 Virgin Mercury 9612 Virgin Mercury 11862
204675 234678 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 Maestà 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.

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

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. a place under ground, by which the water runs away. Stopping the hole E, there is a perpetual strong wind, issuing forth at G: and G. being stopt, the wind comes out so vehemently at E, that it will, I believe, make a Ball play, like that at Frescati.

An Extract of a Letter, containing some Observations, made in the ordering of Silk-worms, communicated by that known Vertuoso, Mr. Dudley Palmer, from the ingenuous Mr. Edward Digges.