[489] 
Certain Obfarvations of the Midland Salt-Springs of 
Worcefter-fiiire, Stafford-fliire Chefliire. 
of the Crude Salt, which grows from the Stone-pow- 
6.Qt dejeiled by the faid Brines in Boyling, Of the 
cifick difference betwixt Sq2l Salt and Common Salt, 
A way ( which feems to be the true method of Nature ) 
</^Diftilling Sweet andVxQ^Waterfrom Sea Water ^ by 
the Breath of Sea Plants growing in it. 
That this BtQSith probably is the Material Caufe of the 
Trade or Tropick Winds. In a Letter tothePubliJher 
from the learnedMd,rtin Lifter Dr. of Phyfick of the- vni- 
verfty of Oxon. 
I Made all the Wtches or noted fait Springs 10 my way 
home from Bath, the laft Summer^ and fpent fome 
N hours in the examining of them. And what parti- 
culars I found over and above not mentioned in the 
PhiL TranfaB, f where they are very accurately writ of^ 
I am about to tell you, as follows. 
But before I proceed Imoft needs bear wirnefs to the 
truth of Dr. G2^/W(?/j- experiments, moft of which I tried 
my felf at Bath, and find him to be a moft Authentic^ 
and faithful writer. I do only yet doubt of the exiftence 
of Bitumen for I cannot find the Floating Scum when 
dryed to have any fuch thing in it. 
At Nor thwich in Chejhire upon the We ever in 4 Pits is 
great plenty of Brine, it ftinks ot Sulphur Apparently 
in all the Pits ; it becomes Atramentous with Galls. 
Here are ufed Sand Pans, which are let down in the 
Corners of the great Iron Boilers, before the Salt ftioots 
into grains, and thefe catch the Sand. 
f N. 5-3, N. 54, N. I42. 
Be- 
