in Britain and in France; whether for money, or not, does not appear. Kunkel, who had mentioned to his friend his intention of getting possession of the process, being vexed at the treacherous conduct of Kraft, attempted to discover it himself, and, after three or four years labour, he succeeded, though all that he knew from Brandt was, that urine was the substance from which the phosphorus was procured. In consequence of this success, phosphorus was at first distinguished by the epithet of _Kunkel_ added to the name. Kunkel published, in 1678, a treatise on phosphorus, in which he describes the properties of this substance, at that time a subject of great wonder and curiosity. In this treatise, he proposes phosphorus as a remedy of some efficacy, and gives a formula for preparing pills of it, to be taken internally. It is therefore erroneous to suppose, as has been done, that the introduction of this dangerous remedy into medicine is a modern discovery. Kunkel appears to have been acquainted with nitric ether. One of the most valuable of his books, is his treatise on glass-making, which was translated into French; and which, till nearly the end of the eighteenth century, constituted by far the best account of glass-making in existence. The following is a list of the most important of his works: 1. Observations on fixed and volatile Salts, potable Gold and Silver, Spiritus Mundi, &c.; also of the colour and smell of metals, minerals, and bitumens.--This tract was published at Hamburg, in 1678, and has been several times reprinted since. 2. Chemical Remarks on the chemical Principles, acid, fixed and volatile alkaline Salts, in the three kingdoms of nature, the mineral, vegetable, and animal; likewise concerning their colour and smell, &c.; with a chemical appendix against non-entia chymica. 3. Treatise of the Phosphorus mirabilis, and its wonderful shining Pills; together with a discourse on what was formerly rightly named nitre, but is now called the _blood of nature_. 4. An Epistle against Spirit of Wine without an acid. 5. Touchstone de Acido et Urinoso, Sale calido et frigido. 6. Ars Vitraria experimentalis. 7. Collegium Physico-chymicum experimentale, _or_ Laboratorium chymicum.[176] [176] I have never seen a copy of this last work; it must have been valuable, as it was the book from which Scheele derived the first rudiments of his knowledge.