Certain observation of the Midland salt-springs of Worcester-shire, Stafford-shire and cheshire. Of the crude salt, which grows from the stone-powder dejected by the said brines in boyling. Of the specifick difference betwixt sea salt and common salt. A way ( which seems to be the true method of nature) of distilling sweet and fresh water from sea water, by the breath of sea plants growing in it. That this breath probably is the material cause of the trade or tropick winds. In a letter to the publisher from