CONTENTS. 
On forming Collections of Geological Specimens ; and respecting 
those of Mr. Surrn in the British Museum. .. We 
Answer io the Letter of C. of Exeter on Steam-Boats to be used 
in conveying Merchandise by Sea. ng ae Ashe 12) f 
On the Cause of the Changes of Colour in Mineral Sakae 5 
On an apparently new Species of Wren, discovered at Tunbridge 
Wells. Se ae ° oi dp Mose = shee 
On the Question “* Whether Music is necessary to the Orator,— 
to what Extent,and how most readily attainable?” .. 32k 
On extracting Alcohol from Potatoes, and preparing Potash 
from Potatoe-tops. .. +e oe ve eo a7 
On the Physiology of Vegetables. As ee -. 34l 
“ Della Purificazione del Mercurio, Memoria del Sig. Dott. 
G. Branchi,’ Sc... -y “e .. 348 
Answer to W.H.G.’s Observations on’ Mr.Tatum’s Experi- 
ments on Vegetation. .. os Ee oe -. dod 
Acknowledgements to Mr.Wesreartu Forster; further Geo- 
logical Queries, on the Basaltic Strata of Durham and 
Northumberland: and Suggestions regarding the Situation 
of the Granite Patches of the North of England, in its Series 
of Strata. oa ce ee Cm) ee oe 358 
Geological Observations on Strathearn. .. oe die: GS 
On the component Parts of Light, and the Cause of Colour. 366 
On the pretended Parallel Roads of Glen Roy. .. .. 374 
On Cosmogony. « 9 we Be oe am 00.0 
New Quadratic Theorem. Py oe oe 378 
On a volatile concrete Oil existing in the Nut-galls of the Oak. AOL 
On the Atomic Theory. bia ae. we Ae 406 
On the Ring of Saturn. ais as ie un 409 
An easy, simple, and infallible Method to force every Fruit- 
Tree to blossom and to bear Fruit. .. ee ut 41h 
On the Resistance of Solids; with Tables of the specific Cohesion 
and the cohesive Force of Bodies. 5 re A13 
Some further Observations on the Use of the Colchicum autum- 
naleinGout. .«. we yh we ote «» 428 
Experiments and Observations upon the State of the Air in 
the Fever Hospitals of Cork, at a Time when they were 
crowded with Patients labouring under Febrile Contagion. 433 
Upon 
