18. Additional Observation on the Proportion of Real 



Acid in the three ancient known Mineral Acids, 

 and on the Ingredients in various Neutral Salts, 

 and other Compounds. 1797 



19. Essay on Human Liberty. 1798 



20. Synoptical View, &c. (In the Contents, but not in 



the Volume.) 



21. Synoptical View, &c. 1799 



22. Observations on the Proofs of Huttonian Theory of 



the Earth. 1799 



23. An Illustration and Confirmation of some Facts 



mentioned in an Essay on the Primitive State of 



the Globe. • 1800 



24. An Essay on the Declivity of Mountains. 1800 



25. On Chemical and Mineralogical Nomenclature. 1800 



26. Remarks on some Sceptical Positions in Mr. Hume's 



Inquiry concerning the Human Understanding, 



and his Treatise on Human Nature. 1800 



27. Synoptical Table of the Weather in Dublin. 1800 



28. On the Variations of the Atmosphere. 1801 



29. Synoptical View of the Weather in Dublin. 1 801 



30. Synoptical View, &c. 1802 



31. Synoptical View, &c. 1803 



32. On Space and Duration ; of Duration, Time, and 



Eternity. 1 805 



33. Synoptical Table. 1805 



34. On the Primaeval Language of Mankind. 1805 



35. Description of a new Anemometer. 1808 



36. Synoptical View, continued to 1808. 1808 



37. An Essay on Happiness. 1809 



38. On the Origin of Polytheism, Idolatry, and Grecian 



Mythology. 1808 



Some of the foregoing essays were afterwards much enlarged, 

 and published in independent volumes. Besides these, he pub- 

 lished a System of Mineralogy, which passed through two editions, 

 and was translated into the French, German, and Russian lan- 

 guages. His work on Logic appeared in two volumes octavo ; it 



