CONTENTS. 
XV.—A New Method of Investigating Relations between Functions of 
the Roots of an Equation and its Coefficients. By J. DouGias 
Hamitton Dickson, M.A., Fellow and Tutor of St Peter’s 
College, Cambridge, 
XVI.—On the Phenomena of Variegation and Cell-Multiplication in a 
Species of Enteromorpha. By P. Geppzs, F.R.S.E., Demon- 
strator of Vegetable Histology in the University of Edin- 
burgh, (Plate XIII.), 
XVII.—On the Isruptive Discharge of Electricity. Part IV. By A. 
MAaAcFARLANE, M.A., D.Sc, F.R.S.E., and P. M. Puayrarr, 
M.A. (Plate XIV.), 
XVIII.— Researches in Thermometry. By Epmunp J. Mits, D.Sc., 
F.R.S. Communicated by Professor Sir WiLt1am THomson, 
DCL, FARSe 
XIX..—Preliminary Note on the ee oe of Glass. By'J. Y. 
BUCHANAN, , z : 
XX.—On the Variation with Temperature of the Electrical Resistance 
of Wires of certain Alloys. By Professor J. G. MacGREGor, 
D:Se:, and €.:G. Knorr, D.Se:, 
XXI1.—On the Differential Telephone. By Professor CurystTAt, 
XXII.—WNotice of the Completion of the New Rock Thermometers at the 
Royal Observatory, Edinburgh, and what they are for. By 
Professor Piazzi SmMytu, Astronomer Royal for Scotland. 
(Plate XV.}, 
XXIII.—Note on a Theorem in Geometry of Position. By Professor 
Tair. (Plate XVI), . ; 
Vil 
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