CONTENTS. 



ART. I. Account of an Improvement in the Construction 

 of Wollaston's Goniometer. By EDWARD SANG, 

 Esq., F.R.S.E., Vice-Pres. Soc. Arts, Teacher 

 of Mathematics, &c. Edinburgh. Communicated 

 by the Society of Arts. . . Page 213 



II. On the Mineral Springs of Iceland. By C. KRUG- 



VON NIDDA. (Concluded from p. 110), 220 



III. A New Pocket-Box Circle. By WILLIAM GAL- 



BRAITH, Esq., M. A., Teacher of Mathematics, 

 Edinburgh, M. S. A. Communicated by the 

 Society of Arts, . . . 226 



IV. On a Systematic Method of Measuring Surface 



and Solidity. By Mr JOHN SANG, Land- Sur- 

 veyor, Kirkaldy. Communicated by the So- 

 ciety of Arts, .... 231 



V. On the Erroneous Geographical Position of many 



Points in the Frith of Clyde. By WILLIAM 

 GALBRAITH, Esq., M. A., Teacher of Mathe- 

 matics, Edinburgh, M. S. A. Communicated 

 by the Author, .... 248 



VI. On the Geography and Geology of Northern and 



Central Turkey. Part II. Geology. By Dr A. 

 BOUE . (Continued from last Number), . 253 

 VI t. On the Electric Currents observed in some Metal- 

 liferous Veins. By W. J. KENWOOD, Esq., 

 F. G. S., London and Paris, tfon. M. Y. P. S., 

 Assay Master of Tin in H. M. Duchy of Corn- 

 wall. Communicated by the Author, . 

 VIH. Analysis of Fossil Scales from the Old Rod 



