CONTENTS. 
XVIII.--An Account of some Experiments on the Telephone and Micro- 
phone. By James Biytu, M.A., 
XIX.—On some New Bases of the Leucoline Series. By G. Carr 
Rosinson, F.R.S.E., Demonstrator of Chemistry, Public 
Health Laboratory, University of Edinburgh, 
XX.—On Dimethyl-Thetine and its Derivatives. By Professor 
Crum Brown and Dr E. A. Letts, 
XXI.—On the Compounds of Ethyl-, Propyl-, iid and Amyl- 
Thetines. By Dr E. A. Letts, : 
XXII.—A Class of Determinants. By J. Dovetas Hamitron Dicx- 
son, M.A., Fellow and Tutor, Peterhouse, Cambridge, 
X XIII.—On the Disruptive Discharge of Electricity: An Experimental 
Thesis for the Degree of Doctor of Science, Department A. 
By ALEXANDER MAcrartane, M.A., B.Sc. (Plate XXII), 
XXIV.—On the Discharge of Electricity through Oil of Turpentine. 
By ALEXANDER Macrarane, M.A., B.Sc., and R. J. S. 
Smmpson. (Plate XXIV.), 
XXV.—On the Disruptive Discharge of Electricity. By ALEXANDER 
Macrar.ane, D.Sc., and P. M. Piayrarr, M.A. (Plate 
XXV.), 
XXVI.—The Preparation and Properties of Pure Graphitoid and 
Adamantine Boron. By R. M. Morrison, D.Sc. ae 
and R. SypNEy Marspen, B.Sc. (Edin.), 
XXVITI.—On a New General Method of Preparing the Primary Mona- 
mines, &c. By R. Mitner Morrison, D.Sc., 
XXVIIL—On a Method of Determining the Cohesion of Liquids. By J. 
B. Hannay, F.C.S. (Plate XXIV.*), 
571 
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625 
673 
679 
689 
693 
697 
