SCIENTIFIC COMMUNICATIONS 



RECEIVED AT 



THE SOCIETY'S MEETINGS. 



February, 1831.— A Clock of M'Dowall's construction, with spiral 

 teeth instead of pinions, was exhibited and explained to the Meeting, by 

 Jonathan Gray, Esq. 



March. — Notice of a simple method of measuring certain inacces- 

 sible distances ; — notice of the construction of a new perpetual Sunday 

 Calendar, by the Rev. Wm. Taylor, A.M. 



On a new and very easy construction of the Dipping Needle, by 

 John Phillips, F.G.S. 



Summary of Meteorological Observations at Ackworth, in 1830, 

 by Luke Howard, F.R.S., &c. 



April. — Remarks on the materials employed at different times in 

 the ancient buildings of York, by the Rev. W. V. Harcourt, F.R.S., &c. 



Observations on a specimen of the lower jaw of a didelphine 

 quadruped, obtained forty years since from the Stonesfield slate, and 

 presented to the Museum by the Rev. C. Sykes, by John Phillips, 

 F.G.S. 



July. — A description of the skeleton of a plesiosaurus from 

 Hawsker, now in the Scarborough Museum, by John Dunn, Esq. 



Observations on an ancient leaden coffin, lately opened in York 

 Minster, by the Rev. C. Wellbeloved. 

 C 4 



