il 
XIIL.—The Effect of Permanent Elongation on the Specific Resistance of Metallic Wires. 
By Tuomas Gray, B.Sc., Demonstrator in Physies and Instructor in Telegraphy, 
Imperial College of Engineering, Tokio, Japan. (Plate XVIIIa.), 
XIV.—On the Histology of the Pedicillarice and the Muscles of Echinus spheera (Forbes). 
By Patrick Geppgs, F.R.S.E., Lecturer on Zoology in the School of Medicine, 
Edinburgh; and Frank E, Bepparp, B.A‘, Assistant Demonstrator of Zoology, 
Oxford. (Plates XIX. to XXT.), 
XV.—On some new Species of Fossil Scorpions from the Carboniferous Rocks of Scotland 
and the English Borders, with a Review of the Genera Koscorpius and Mazonia 
of Messrs Meek and Worthen. By B, N. Pracu, A.R.S.M., FR.S.E., of the 
Geological Survey of Scotland. (Plates XXII. and XXIII), 
XV1.—Effects of Strain on Electric Conductivity. By August WiTKowskI. 
cated by Sir Witt1am THomson, 
Communi- — 
XVII.—On the Constitution of the Lines form.g the Low-Temperature Spectrum of 
By Piazzi Smytu, Astronomer-Royal for Scotland, . 
Oxygen. 
383 
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