36* ITmtsfor the "Formation of 



4. The theory of the calcination of metals, and of the de- 

 compofition of water. 



5. Meafuring heights by the barometer. 



6. How the temperature of climates is modified by the" 

 winds, evaporation, the nature and elevation of the ground. 



7. Whether thefe caufes are fufficient to explain certain 

 changes, fuch as that of the plants and animals of warmer 

 countries having been able to exift and multiply in the 

 coldeft countries ? 



8. Mineralogy, the nature of earths, ftones, falts, bitu- 

 minous fubftances and metals. The principles of their 

 analyfis and nomenclature. 



9. If it be poffible to tranfmute one earth or one metal 

 into another. For example, if it be poffible that filiceous 

 earth can be changed into calcareous earth m the bodies of 

 marine animals; or, reciprocally, that calcareous can be 

 changed into filiceous earth in mountains of chalk ? 



10. If it be probable, according to the conjecture of 

 Lavoifier, that earths are the oxyds of metals ? 



11. What idea can we form of one or more folvents 

 which, either fimultaneoufly or fucceffively, may have ren- 

 dered foluble in water the different mineral fubftances which 

 we fee on the furface and in the bowels of the earth ? 



12. Can we believe that thefe folvents may have been* 

 afterwards deftroyed ; and that it is in confequence of their 

 deftruftion that the matters they held in folution were pre- 

 cipitated and became cryftallifed ? 



13. A. Or, can we believe, with Dolomieu, that all cryf- 

 tallifations m?y take place without previous folution; and; 

 that it is fufncient for this operation that the bodies be re- 

 duced to their elementary parts, and that thefe parts be fuf- 

 pended in a fluid which gives them liberty to unite by their 

 correfponding faces ? 



13. Can we fuppofe that the electric and magnetic fluids 

 enter, as elements, into the compoiition of bodies ? 



14. Does 





