CONTENTS. VII 



Pago 

 A Method of Fixing Particles on the Sappare ... 90 

 Thomson's Annals of Philosophy, Vol. XXII ; New Series, 

 Vol. VI, 1823, p. 412. 



On some Compounds of Fluorine 94 



Thomson's Annals of Philosophy, Vol. XXIII ; New 

 Series, Vol. VII, 1824, p. 100. 



An Examination of some Egyptian Colors .... 101 

 Thomson's Annals of Philosophy, Vol. XXIII ; New 

 Series, Vol. VII, 1824, p. 116. 



Some Observations on Mr. Penn's Theory concerning the for- 

 mation of the Kirkdale Cave . . . . . 103 

 Thomson's Annals of Philosophy, Vol. XXIV ; New Series, 

 Vol. VIII, 1824, p. 60. 



A letter from Dr. Black describing a very sensible Balance . 117 

 Thomson's Annals of Philosophy, Vol. XXVI ; New Series, 

 Vol. X, 1825, p. 52.- 



A Method of Fixing Crayon Colors 120 



Thomson's Annals of Philosophy, Vol. XXVI ; New Series, 

 Vol. X, 1825, p. 236. 



II. — Reviews. 



A Memoir on the Scientific Character and Researches of 

 James Smithson, Esq., F. R. S., by Walter R. John- 

 son 123 



On the Works and Character of James Smithson, by J. R. 



McD. Irby . . .143 



Index 157 



