PREFACE. 



Strengths of Spirits without Computation. 6. Mr. Read's 

 very simple and cheap Pneumatic Apparatus. 7. The new 

 moveable Crane ere&ed by Mr. Keir at Ramsgate. 8. Haas's 

 Blow-pipe Apparatus. 9. Figures by Mr. Jameson, to 

 illustrate the Formation of Basalt. 10. Elements of the Gal- 

 vanic Pile, by Dr. Bostock. 1 1 . Distinguifhers of Galvanism 

 and Electricity. 12. Gay Lussac's Apparatus for measuring 

 the Expansions of the Gases. 13. The Indian Hand Mill. 

 14. A Secret Lock, which can be opened only by the Pro- 

 prietor. 15. Improvement of Wo ulfe's Apparatus, by Mr. 

 Murray. 16. Dr. Young's Apparatus for exhibiting the 

 colours of thin plates. 17. Figures by Prevost, for explaining 

 the Phenomena of Dew. 



Soho Square, Dec. 26, 1802. 



