CONTENTS. 



On Electro-galvanic Agency employed as a Moving Power ; 

 with a Description of' a Galvanic Clock 261 



Hemarks on Mr. Bakevvell's Geology on Northumberland and 

 Durham 264 



Dr. Gregory, in Answer to Mr. Harvey's Mathematical 

 Question 268 



An earnest Recommendation to curious Ladies and Gentlemen 

 residing or visiting in the Country, to examine the Quarries^ 

 Cliffs, steep Banks, d^c. and collect and preserve Fossil Shells, 

 as highly curious Objects in Conchology, and, as most impor- 

 tant Aids in identifying Strata in distant Places ; on luhick 

 Knowledge the Progress of Geology in a principal degree, if 

 not enliiely, depends 274 



TjTplanation of certain Improvements in the Construction and 

 Fastening of the Frame Timbers of Ships or Vessels, either 

 when Building, or when under Repair, for the more effectually 

 preventing the Disunion of the Parts caused by Hogging, and 

 the transverse bending of the Hull 280 



Further Queries, as to the proper Places in the British Series of 

 Strata, of the Newcastle Grindstone Rock and its Muscle 

 Shell Ironstone, and of certain organized Remains found near 

 Cambridge 295 



Mr, Bakewbll in Reply to Mr, Frerej and on some peculiar 



Properties of Light ", .. .. 297 



On Coal Formations 300 



Mr. Hume's New Process for Emetic Tartar .. . . 301 



On Carbonate of Ammonia as a Manure 303 



On the Roots of Plants differing in each Soil . . . . 321 



A Reply to Mr. Donovan's Observations, &c. on Mr. DeLuc's 

 Paper published in our Number for February .. ., 329 



Observations on the Priority of Mr. Smith's Investigations of 

 the Strata of England ; on the very unhandsome Conduct of 

 certain Persons in detracting from his Merit therein ; and 

 the Endeavours of others to supplajii him in the Sale of his 

 Maps;— with a Reply to Mr. W. H. Gilby's Letter 333 



Some Experiments and Observations on the Colours used hi 

 Painting by the Ancients 349,414 



The Electric Column considered as a maintaining Power, or 

 FirstMover for mechanical Purposes 359 



On the Coal and Stone Strata of Durham 363 



Account of a recent melancholy Occurrence at Heaton Colliery 



364 



