Viil CONTENTS. 
VIITI.—On Knots. By Professor Tair. (Plates XV., XVI.), 
IX.—On the Toothing of Un-round Discs which are intended to Roll 
upon each other. By Epwarp Sane, Esq., 
X.—Chapters on the Mineralogy of Scotland. Chapter Second.— 
The Felspars. Part I. By Professor Heppre. (Plates 
KVIL, XVILL), 
XI.—On the Curves produced by Reflection from a Polished Revolv- 
ing Straight Wire. By Epwarp Sane, Esq. (Plate 
XIX), ; 

PART II. (1877-1878.) 
XIL—On the Solid Fatty Acids of Coco-Nut Oil. By G. Carr 
Rosinson, F.R.S.E., Demonstrator of Chemistry, Public 
Health Laboratory, University of Edinburgh. (Plate 
XTUI.—On the Tabulation of all Fractions having their values 
between Two Prescribed Limits. By Epwarp Sana, Esq,, . 
XIV.—Chapters on the Mineralogy of Scotland. Chapter Third.— 
The Garnets. By Professor HEDDLE, 
XV.—On the Thermo-Electric Properties of Charcoal and certain 
Alloys, with a Supplementary Thermo-Electric Diagram. 
By GC. C. Kwnort, B.Sc., and J. G. MacGrecor, D.Sc. 
(Plate XXT.), 
XVI.—On the Old Red Sandstone of Western Europe. By Professor 
GEIKIE, LL.D., F.R.S. (Plate XXII.), 
XVII.—Chapters on the Mineralogy of Scotland. Chapter Fourth.— 
Augite, Hornblende, and Serpentinous Change. By Pro- 
fessor HEDDLE, ; 4 ; ; ; 
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