TABLE OF CONTENTS. 
NUMBER XLIX.—JANUARY, 1817. 
, ~Page 
Account of the Improvements in Physical Science during the Year 1816. 
By Dr. Thomson.......6..01ccerscccersecenesssecceceresecececeres 1 
Further Observations respecting the Decomposition of the Earths. By 
Clarke: co ueaae news ahek aca lpr Oats Sulsteeiola ils aleleielcratets Sede site's 89 
a 
NUMBER L.—FEBRUARY. 
Narrative of a Journey from the Village of Chamouni, in Switzerland, to 
the Summit of Mount Blanc. By Col. Beaufoy ............0+s-se0- 97 
On the Acids contained in the Juice of the Stems of Rhubarb. By M. 
Donovan, Esq. «.....++.++- ele okies ES adil scien 0's so mce ee emanas 103 
On the Composition of the Topaz; the Separation of Silica and Oxide of 
Tantalum ; and some further Experiments on the Composition of Or- 
ganic Bodies. By Dr. Berzelius..........cseseeeeceeeee seeeererees 105 
Method of finding the Heights of Mountains with the Barometer, by 
Means of a Table of Compound Interest. By A. Anderson, Esq. .... 108 
Curious Experiments on boiling Tar. By R. Davenport, Esq......--.+ 114 
Some Observations on the Geology of South Wales. By Dr. Gilby .... 114 
Notes of a Mineralogical Excursion to the Giant’s Causeway. By the 
Reeve Prairie sareeieg tate ocisine ritlotslcls sa olplaia bie lsicreraisia'sialelo\ota cit hel stel ote te\e 118 
Chemical Classification of Minerals. By Mr. Sowerby ........-+-.-+- 124 
. Essay on the Explosions in Coal-Mines. By Mr. Longmire, concluded,. 131 
On the Ancient Purpurissum: the State of Turkey Red Dyeing in the , 
Greek Empire : and the Means of procuring a Substitute for Purpu- 
MAAS Ns APD cs Seattle) Sin: af DE o what ae Ey BUG Saeed spatiale Liens ewa ters oe 134 
On Magnetism. By Mr. Horn ......eceeeeeeeene eee s teen cece ceaeeees 137 
Critical Analysis of Wahlenberg on the Carpathian Mountains ........ 140 
Proceedings of the Royal Society, Nov. 30, Dec. 5, 12, 19, 1816; Jan. 
Oy HIG a S8y ABUT Lite sets Wendy aghsaiiies Laaelh ind Be waeeiees 148 
——_—____—_———- Linnzan Society, Dec 3, 17, 1816; and Jan. 21,1817.. 153 
Royal Institute of France... ....eeeeee sees ee eee ees 155 
Datices'of Lecturesiiens ss sca «trail. livisetaletan > a sieleld on ove ean eg 
New Swedish. Minerals ......0..cccccerccccccsccccconercesessesieetves 160 
Measurement of the Earth .......cccceccecceectereeteseeeeaceceesenes 161 
London Charity Schools........-c0cseceereeeeeree cere eeneeeeeanenenes ibid. 
Heights near London .....sssecescesesdeveerersngenseessensssseven eves ibid. 
