CONTENTS. VII 



Page 



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. 115. 



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

 mation of the Kirkdale Cave 103 



Thomson's AnnaUof Philosophy, Vol. XXIV ; New Series, 

 Vol. VIII, 1824, p. 50. 



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 



