CONTENTS. Ill 



ART. PAGE 



X. The Bakerian Lecture on the best kind of Steel and 

 Form for a Compass Needle. By Capt. H. Kater, F.R.S. 132 



xi. Notice respecting a Volcanic Appearance in the Moon, 

 in a Letter addressed to the President. By Capt. H. 

 Kater, F.R.S 133 



xii. A further Account of Fossil Bones, discovered in 

 Caverns enclosed in the Limestone Rocks at Plymouth. 

 By Joseph Whidbey, Esq 133 



xiii. On the Aeriform Compounds of Charcoal and Hy- 

 drogen, with an Account of some additional Experiments 

 on the Gases from Oil and from Coal. By William 

 Henry, M.D. F.R.S., &c 133 



XV. Astronomical & Nautical Collections, No.VII. 137 



i. An Essay on the easiest and most'convenient method 

 of calculating the Orbit of a Comet from Observations. 

 By William Olbers, M.D 137 



ii. An easy method of computing the Aberration of the 

 Stars. By the Rev. John Brinkley, D.D., Professor 

 of Astronomy in the University of Dublin 151 



XVI. The Clock's Daily Rate aud Error at one time of 

 the Day being known, a Table to find its correspond- 

 ing Error throughout the Day. By J. South, Esq. 

 F.R.S 155 



XVII. Miscellaneous Intelligence 168 



I. Mechanical Science. 

 § The Arts, Manufactures, S)C. 

 1. Application of the Air Pump. 2. Adhesive Pelt. 

 3. The Apograph. 4. New Madder Lake. 5. Contami- 

 nation of Salt for Manufactories 168 



II. Chemical Science. 



% Chemistry, Electricity, Magnetism, 8jC. 



1. On the Analysis of Alkaline Minerals. By M.Berthier. 



2. Compounds of Molybdenum, Chromium, Tungsten, 



Antimony, &c. 3. Oxide of Chromium. 4. Carburet of 



Nickel. 5. On the Alloys of Chromium, Iron, and Steel. 



