( 4*4 ) 
That it was the Sediment of the 7 hawes, that hurried 
thofe Trees, is farther manifeft from what l faid before, 
of the likenefs of the Earth above them, in all refpe&s, 
to the Sediment the River now lets fall, when dry 5 a 
Sample of which accompanieth this Paper: Which may 
be obferv’d to confift of many diftinft Layers ^ forae A- 
of an Inch thick, fome lefs, and fome fcarce of an Inch. 
All wh : ch feveral Layers are, no doubt, the feveral 
quantities which every Tide left behind it. This Sedi- 
ment, when dry’d by the Sun and Wind, becomes tough 
and hard, and looketh like a grey Lapis- Scijjil is , or Slate, 
divifible into many Plates or Layers. And what if we 
(hould afcribe the Conformation of Slate , Mufcovia gUfs , 
and other the like laminated Concretions, to a like work 
cf Nature, by adding new Layers of fuch Petrifa&ions, 
and Particles, as the FoiSle is made of? 
P. S. I prefume there will be no doubt, but that the 
Subterraneous Wood receives its blacknefs from Vitrio- 
lick juices in the Eafth. If any doubt fhould be, I have 
try’d the Experiment, and find that Alder-Wood, whether 
green or old, becomes blackifh, much of the fame colour 
as the Wood before-mentioned in this Paper, in a Solu- 
tion of Copperas. Which is not only an Argument, 
that the blacknefs of the Wood is owing to Vitriol, 
but alfo that the Wood is Alder, or fome fuch like 
Wood, that will become black with Vitriol: for 1 am 
inform'd that all Subterraneous Wood is not black, par-, 
ticularly Fin. I have alfo try’d Hornbeam fioce, after 
the fame manner, and find that alfo becomes black, as 
the Alder doth. 
II. Expert at: 
