5. Acta laboratorii Chymici Monacensis seu Physica Subterranea.--This, which is the most important of all his works, is usually known by the name of “Physica Subterranea.” This is the sole title affixed to it in the edition published at Leipsic, in 1703, to which Stahl has prefixed a long introduction. It is divided into seven sections. In the first he treats of the creation of the world; in the second he gives a chemical account of the motions and changes which are constantly going on in the earth; in the third he treats of the three principles of all bodies, which he calls _earths_. The first of these principles of metals and stones is the _fusible_ or _stony earth_; the second principle of minerals is the _fat earth_, improperly called _sulphur_; the third principle is the _fluid earth_, improperly called _mercury_; in the fourth section he treats of the action of subterraneous principles, or the formation of _mixts_; in the fifth he treats of the solution of the three classes of mixts, animals, vegetables, and metals; in the sixth he treats of _mixts_, in which he gives their chemical constituents. This section is very curious, because it gives Beccher’s views of the constitution of compound bodies. It will be seen from it that he had much more correct notions of the real objects of chemistry, than any of his contemporaries. In the seventh and last section he treats of the accidents and physical affections of subterraneous bodies. 6. Experimentum Chymicum novum quo artificialis et instantanea metallorum generatio et transmutatio, ad oculum demonstratur.--This constitutes the first supplement to the Physica Subterranea. 7. Supplementum secundum in Physicam subterraneam, demonstratio philosophica seu Theses Chymicæ, veritatem et possibilitatem transmutationis metallorum in aurum evincentes. 8. Trifolium Beccherianum Hollandicum. 9. Experimentum novum et curiosum de Minera arenaria perpetua, sive prodromus historiæ seu propositionis Præp. D.D. Hollandiæ ordinibus ab authore factæ, circa auri extractionem mediante arena littorali per modum mineræ perpetuæ seu operationis magnæ fusoriæ cum emolumento. Loco supplementi tertii in Physicam suam subterraneam. 10. Chemical Luckpot, or great chemical agreement; in a collection of one thousand five hundred chemical processes. 11. Foolish Wisdom and wise Folly. 12. Magnalia Naturæ. 13. Tripus Hermeticus fatidicus pandens oracula chemica; seu I. Laboratorium portatile, cum methodo vere spagyricæ seu juxta exigentiam naturæ laborandi. Accessit pro praxi et exemplo; II. Centrum mundi concatenatum seu Duumviratus hermeticus s. magnorum duorum productorum nitri et salis textura et anatomia atque in omnium præcedentium confirmationem adjunctum est; III. Alphabetum Minerale seu viginti quatuor theses de subterraneorum mineralium genesi, textura et analysi; his accessit concordantia mercurii lunæ et menstruorum. 14. Chemical Rose-garden. 15. Pantaleon delarvatus.