TRANSACTIONS 
OF THE 
VOL. XXX. PART I—FOR THE SESSION 1880-81. 
/68: 
CONTENTS. 
Arr. 1.—The Law of Extensible Minors in Determinants. By Tuomas Muir, M.A., 
Il.—On some Transformations connecting General Determinants with Continuants. 
By Tuomas Murr, M.A., 5 , ; : : 
IlL.— Report on Fossil Fishes collected by the ice Survey of Scotland in Eskdale 
and Liddesdale. Part I.—Ganoidei. By Ramsay H. Traquair, M.D., F.R.S., 
Keeper of the Natural History Collections in the Museum of Science and Art, 
Edinburgh. (Plates I. to VL, which will be given in the next Part), . 
IV.—On some new Crustaceans from the Lower Carboniferous Rocks of Eskdale and 
Liddesdale By B. N. Peacu, A.R.S.M., F.G.S., of the Geological Survey of 
Scotland. Communicated by Professor Guixin, F.R.S. (Plates VII. to X.), 
V.— Gaseous Spectra in Vacuum Tubes, under small Dispersion and at low Electric 
Temperature ; including an Appendix III., by Prof. ALExanper 8S. Herscuen, 
M.A., Newcastle-on-Tyne. By Professor Piazz1 Smytu, Astronomer-Royal for 
Scotland. (Plates XI. and XIL), 
VI.—On a Special Class of Sturmians. By Professor CurystTat, : : 
VIL—On the Cranial Osteology of Rhizodopsis. By Ramsay H. Traquarir, M.D., 
F.R.S., Keeper of the Natural History Collections in the Museum of Science 
and Art, Edinburgh, : : P : } 
VIIIL.—On the Action of Phosphide of Sodiwm on Haloid Ethers and on the Salts of 
Tetrabenzyl-Phosphonium. By Professor Lerrs and N, i; soa a . E.R.SS. 
L&E, : . . 
1X.—On the Geology of the Feriée Islands By James Gurxie, acre E.R.SS. L. & E. 
(Plates XIII. to XVI.), ; . 
X.—Researches in Contact Electricity. By Caran G. Knorr, D.Sc. Communicated 
by Professor Tair. (Plate XVII), 
XL—On Phosphorus-Betaines. By Professor Letts. (Plate XVIIL), 
XII.—On Dust, Fogs, and Clouds. By Joun A1rKen, . 
(For remainder of Contents sce last page of Cover.) 
ROYAL SOCIETY OF EDINBURGH. 
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