▼1 CONTENTS. 



Pftge 



A New Method of Iianging SI nice- Doors and Flood-Crates. By W. Mar- 

 rat, AM 855 



Reply to C.*s Observations on Mr. Herapath's Theory 357 



Meteorological Journal kept at Manchester for 1 821 . By Mr. Hanson . . 371 

 On Blocks of Granite, Syenite, &c. imbedded on Diluvium. By Mr. N. J. 



Winch k ».. k 4 i . ^ . ^ ; i . . . . 373 



On the Geology of the Eastern Part of Yorkshire. By Mr. N. J. Winch 374 

 List of the Freshwater and Land-shells occurring in the Environs of Bris- 

 tol, with Observations. By Mr. Miller 376 



Remarks on Mr. Moyle's " Observations on the Temperature of Mines in 



Cornwall." By R. W. Fox, Esq 381 



Answer to Mr. Murray's " Reply." 384 



On the Influence of Moisture in modifying the Specific Gravity of Gases. 



By Dr. Apjohn 385 



Analytical Account of the Use of the Blowpipe in Chemical Analyses, 

 and the Examination of Minerals. By J. J. BerzeKus. Translated 



from the French, by J. G. Children, Esq 387 



Proceedings of the Royal Society, March 28, April 18, and 25 3gi 



Arrow Root 39 1 



Seeds of the Croton Tiglium .- 39I 



Specific Gravities 3g2 



Effect of Heat on the colouring Matter of the Ruby 392 



Large Human Calculus 392 



Arseniuretted Hydrogen Gas 393 



On the Roots of Black Hellebore S93 



Heavy Spar : S93 



Slide of Alpnach 393 



Preparation of the Protosulphuret of Mercury 394 



New Scientific Books t,\. /.., 394 



New Patents ; S95 



Astronomical, Magnetical, and Meteorological Observations. By Col. 



Beaiifoy, FRS 396 



Mr. Howard's Meteorological Journal for March 399 



NUMBER VL-JUNE. 



Account of a Volcanic Eruption in Iceland. By Dr. Forchhammer 401 



Astronojnical Observations. By Col. Beaufoy, FRS 406 



On a Clock with a Wooden Pendulum. By Col. Beaufoy, FRS 406 



On the Motions produced by the Diflerence in the Specific Gravity of 



Bodies. By Mr. C. Sylvester 408 



On the Temperature of Mines in Cornwall. By Mr. M.P. Moyle 415 



On Neutral Series. By Mr. Marrat 417 



Influence of Humidity in modifying the Specific Gravity of Gases. By 



John Herapath, Esq 4 ! 9 



