CONTENTS. 



Olservalions on the Geology of Nor thumher land and Durham : 

 and Remarks on Mr. Westgarth Fopster's Section of the 

 Strata, uith a Sketch of the physical Structure of that Part 

 of England, from (he German Ocean to the Irish Channel 8 1 



Observations on Mr. Donovan's Reflections on the Inadequacy 

 of the principal Hypotheses to accoimtfor the Phcenomena of 

 Electricity 97 



Queries, as to Grindstones and Ironstone in Durham, and Shells, 

 &c. near Cambridge 108 



On Fire Damps i7i Mines, ^c. I 116 



On the Optical Properties of Sulphuret of Carbon, Carbonate 

 ofBarytes, and Nitrate of Potash, with Inferences respecting 

 the Structure of duubly rejracting Crystals .. .. Il8 



Of the Physioloey of certain Disorders of Health founded on a 

 Knoivledge of the proportionate Development and Functions 

 of the special Organs of the Mind 129 



On the Rules fur Algebraical Multiplication . . . . 137 



Short Notices of Geological Observations made in the Summer 



of 1814, in the South of Yorkshire, and in North Wales, and 



of some Inferences therefrom, as to the Structure of England 



and IVales 161 



On the Phcenomena attending the Roots of Plants in snowy 

 IVealher 177 



On the Rate of going of two Clocks, uith Remarks on Harris's 

 Pejidulum Clock erected in \64\ 178 



On Steam-Boats ^ . . . . 181 



jf Paper proving that the Embryos of the Seeds are formed in 



the Root alone 1 83 



On Mr. Fearne's Observations on external Perception, &fc. 193 



On the Pyramids of Egypt 194,285 



Observations on a Paper by G. A. De Luc, Esq. containing 

 some Remarks on Mr. Donovan's Reflections concerning the 

 Inadequacy of electrical Hypotheses 200 



On certain Products obtained in the Distillation of Wood, with 

 some Account of bituminous Substances, and Remarks on 

 Coal . . . . 203, 269 



On the Electric Fluid 218, 



On Mr. Bakevvell's Geological Section of the Northern Coun- 

 ties of England 219 



On the late Plague at Malta 24 1 



Some Account of the Island of Teneriffe 248 



