CONTENTS 



OF 



THE QUARTERLY JOURNAL, 



N°. XXIX. 



ART. PAGE 



I. Ou the Curvature of the Arches of the Bridg-e of the Holy Tri- 

 nity at Florence {with a Plate). By Samuel Ware, Esq. 1 



IL A History of a painfiil and obstinate Affection of the Brain, 

 which ultimately yielded to the unremitting' Application of 

 Cold, and the continued erect Position for a week. By 

 G. D. Yeats, M.D., F.R.S., Fel. of the Roy. Col, Phys. 8 



in. An Account of the Rock Specimens collected by Captain 

 Parry, during' the Northern Voyage of Discovery, per- 

 formed in the Years 1819 and 1820. By Charles Konig, 

 Esq., F.R.S., &c 11 



IV. On the Influence of Local Attraction upon the Magnetic 



Needle. By Mr. John Macneill . . . .22 



V. Lamarck's Genera of Shells {ivith Plates) .... 23 



VI. On a Mode of protecting the Specula of Reflecting Telescopes 53 



VII. Experimental Inqumes relative to the Formation of Mists. 



By George Harvey, Esq., Member of the Astronomical 

 Society of London 55 



VIII. On the Light produced by the Discharge of an Air-gun . 64 



IX. Details of a Barometrical Measurement of the Sugar-loaf 



Mountain at Sierra Leone, and of other Heights situated 

 within the Tropics. In a Letter from Captain Edward 

 Sauinr, of the Royal Artillery, to J. F. Daniell, Esq. 67 



X. On Hydrate of Chlorine. By M. Faraday, Chemical As- 



sistant in the Royal Institution 71 



a 



