Ne. I: 
XII. 
XIII. 
CONTENTS 
OF 
Vou. II. Parr I. 
—>_ 
PAGE 
On the Distribution of the Colouring Matter, and on certain peculiarities 
in the Structure and Optical Properties of the Brazihan Topaz: 
Osh), Dike, RUMEN Ma Ase ach, Se en Ge as Nee OER 1 
On the Rotatory Motion of Bodies: by W. WueEweEit, Esq............ 11 
On the Phenomena connected with some Trap Dykes in Yorkshire and 
Durham: by Professor SEDGWIOCK ... 0.02... eeeeeeeeee eee ces ee. 21 
A new Demonstration of the Parallelogram of Forces: by J. Kine, Esq. 45 
On the Developement of Electro-Magnetism by. Heat: by Professor 
ELECTS dot OSE aire ae ge fe PC li apna 47 
Extract from a Memoir on a Peculiar Connexion which exists between 
the Magnetism evolved by a Single Galvanic Combination, and the 
relative Magnitude of’ the Opposing Surfaces of that Combination: 
PE Nap SURE HORN SERED, aly. Shas cee oc oy... 77 
On an Apparatus for Grinding Telescopic Mirrors and Object Lenses : 
Bee RWW, Cacti, ott on tales. ee 85 
On the use of Silvered Glass Jor the Mirrors of Reflecting Telescopes: 
by G. B. Airy, Bethe scat sa tate aa: Mee Ur tice eye thee kee 105 
An Account of some Experiments made in order to determine the Vi elocity 
with which Sound is transmitted in the Atmosphere : by Dr. GREGORY 1 19 
On the Association o Trap Rocks with the Mountain Limestone For- 
mation in High Teesdale: by Professor MEDGW Knees 139 
On the Angle made by two Planes, or two straight Lines, referred to three 
oblique Co-ordinates: by W. WHEWEIL, Esqie. soc. oc- osc... 197 
On the F: 7gure assumed by a Fluid Homogeneous Mass, whose Particles are 
acted on by their mutual Attraction, and by small extraneous Forces : 
by G. B. Airy, | SET cB Ger a ae i SE a 203 
On the Determination of the General Term fa New Class of Infinite 
Series: by C. Banmaa, Eeq......0s0:. 0s. qbee"0 SoLnbccerDoee 218 
Qo x 
