A Continuation of the Discourse Concerning Vitriol, Begun in Numb. 103. Shewing, that Vitriol is Usually Produced by Sulphur, Acting on, and Concoagulating with, a Metal; And Then Making Out, that Allom is Likewise the Result of the Said Sulphur; As Also Evincing, that Vitriol, Sulphur, and Allom, Do Agree in the Saline Principle; And Lastly, Declaring the Nature of the Salt in Brimstone, and Whence It is Derived