ve been added, that the
Gentleman there mention'd, did affirm, that, in those places, where the
Wild _Penny-Royal_ or _Dittany_ grows, no _Ratle-Snakes_ are observed to
come.

* * * * *

_Errata._

Pag. 59. line 11. read, _bignesses_, l. 20. r. _endure_, for, resist. l.
30. r. _those_, for, these. l. 31. r. _Plain_, for, place.

* * * * *

_LONDON,_

Printed with Licence, By _John Martyn_, and _James Allestry_, Printers to
the _Royal-Society_, at the _Bell_ in St. _Pauls Church-Yard_. 1665.

{79}

* * * * *

_Numb._ 5.

PHILOSOPHICAL
_TRANSACTIONS._

* * * * *

_Munday_, _July_ 3. 1665.

* * * * *

The Contents.

_An Account, how _Adits_ and _Mines_ are wrought at _Liege_ without
_Air-shafts_, communicated by Sir _Robert Moray_. A way to break
_easily_ and _speedily_ the hardest _Rocks_; imparted by the same
_Person_, as he received it from Monsieur _Du Son_ the Inventor.
Observables upon a _Monstrous Head_. Observables in the Body of the
Earl of _Belcarres_, sent out of _Scotland_. A Relation of the designed
Progress to be made in the _Breeding of Silk-worms_, and the _Making_
of _Silk_, in _France_. Enquiries touching _Agriculture_, for _Arable_
and _Meadows_._

* * * * *

_An Account, how _Adits_ & _Mines_ are wrought at _Liege_ without
_Air-shafts_, communicated by Sir _Robert Moray_._

It is well known to those conversant in _Mines_, that there is nothing of
greater inconvenience in the working or _driving_, as they call it, of
_Mines_ or _Adits_ under ground, for carrying away of Water, or such
_Minerals_ as the _Mine_ affords, than the _Damp, want,_ and _impurity of
Air,_ that {80} occur, when such _Adits_ are wrought or driven inward upon
a _Level_, or near it, 20, 30, or 40. fathom, more or less. Aswel because
of the expence of money, as of time also, in the _Ordinary_ way of
preventing or remedying those inconveniences; which is, by letting down
_shafts_ from the _day_ (as _Miners_ speak) to meet with the _Adit_; by
which means the Air hath liberty to play through the whole work, and so
takes away bad vapours and furnishes good Air for Respiration. The Expence
of which _shafts_, in regard of their vast depth, hardness of the Rock,
drawing of water, &c. doth