DESCRIPTION OF PLATES IN VOL. IV. 



PLATE I. Fig. 1 5. Mr Hart's Galvanic Battery. 



Fi \ 6. Volcano of Jorullo. 



Fig. 7. Illustrative of Savart's Paper on Organ Pipes. 



Fig. 8. Thaumatrope. 



Fig. 9. Optical Deception of Le Cat. 



Fig. 10, 11. Geology of the North and South side of Lochness. 



Fig. 12, 13. Mr Adam's Nautical Eye-Tube. 



Fig. 14—22. Figures illustrative of the Illusion of the Conversion 



of Cameos into Intaglios. 

 Fig. 23. Optical Illusion seen through a Telescope. 

 Fig- 24. Reservoir for Mills. 

 Fig. 25. Nirnmo's Rotatory Gas- Burner. 

 Fig. 20—28. Method of Securing the Axles of Carriages. 

 Fig. 27 — 30. Concretions in Sandstone. 



Fig. 31. Mr Foggo's Electrometer for Atmospherical Electricity. 

 Fig. 32, 33. Improved Hygrometer. 

 Fig. 34. Berzelius'sMethod of Detecting Arsenic. 

 PLATE II. Is illustrative of the Crystalline Forms of thp Manganpsp Ops. 

 PLATE III. Illustrates Dr Wollaston's Paper on the Direction of the Eyes in 



Portraits. 

 PLATE IV. Represents the Head, Hands, and Feet, of the Gigantic Orang 



Outang from Sumatra. 

 PLATE V. Fig. 1 11. Are illustrative of M. Savart's Memoir on the Me- 

 chanism of the Human Voice- 

 Fig. 12. Mr Waddell's Punt-Boat. 

 Fig. 13- — 19. Are illustrative of Professor Oersted's Paper on the 



Compression of Gases. 

 Fig. 20.— 26. Illustrate Dr Gustavus Rose's Paper on Epistilbite. 

 Fig. 27- Represents the Annual Daily Curve of the Thermometer at 

 Leith Fort, as deduced from Observations made every hour of the 

 Day. See our next Number, 



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