(S9) 
Although there be a great affinity be-' 
between Crujls and Sediments^ yet they 
are eafily difcerned by this, that the up¬ 
per furface of Crufts is parallel ♦ ? ' iie 
lower furface, though very rougi- % put 
the upper furface of Sedimnts is parallel 
to the Horizon, or elfe very little decli > 
ning from it. Thus in Rivers the Mine¬ 
ral Criiils, which fometimes are green, 
fbmetimes yellow, fometimes reddilh, 
take not away the Unevennefs of the fto- 
ny bottom 5 but the Sediment of Gra¬ 
vel or Clay maketh all plain: whence 
I have been able very eafily in divers 
compounded Beds of the Earth to di- 
ftinguifli Crufts from Sediments, 
About the Matter of Beds the parti¬ 
culars following may be determined. 
1. It in a Stony Bed all the Particles 
be of the fame nature, and withall fine, 
it cannot rationally be denied, that that 
Bed was produced at the time of theCre- 
ationoutof that Fluid which then over-! 
whelmed all; After which manner Mon-;* 
fieur Des-Cartes alfo explains the produ- 
ftion of the Beds of the Earth. 
2. If in any Bed there be found the 
fragutents of another Bed, or the parts 
D 4 of 
