CONTENTS. 
XVII.—On the Development of the Ova and Structure of the Ovary 
in Man and other Mammalia. By James Fouuis, M.D. 
Edin. Communicated by Professor TurNER. (Plates 
XXVIT-XXXI), 
XVIIIL.—On the Structure and Affinities of Tristichopterus alatus, 
Egerton. By Ramsay H. Traquair, M.D., F.GS., 
Keeper of the Natural History Collections in the Museum 
of Science and Art, Edinburgh. (Plate XXXII), 
XIX.—On the Diurnal Oscillations of the Barometer. Part I. By 
ALEXANDER BucHAN, Secretary of the Scottish Meteo- 
rological Society. (Plate XX XIII), 
XX.—Photographs of Electric Sparks in Hot and Cold Air. » By 
Professor Tart. (Plate XX XIV.), : 

PART IV. 1875-76. 
XXI—On the Expiatory and Substitutionary Sacrifices of the 
Greeks. By JAMES Dona.tpson, LL.D., : 
XXIL—New General Formule for the Transformation of Infinite 
Series into Continued Fractions. By Tuomas Mutr, 
WIRAG HES E.,. 
XXITI.—On the Stresses due to Compound Strains. By Professor C. 
NivEN. Communicated by Professor Tarr, 
XXIV.— Chapters on the Mineralogy of Scotland. Chapter First.— 
The Rhombohedral Carbonates. Part I. By Professor 
HEDDLE, . A : 3 : 
XXV.—WNotice of High-Water Marks on the Banks of the River 
Tweed and some of its Tributaries; and also of Drift 
Deposits in the Valley of the Tweed. By Davin MILNE 
Home of Wedderburn, LL.D. (Plates XXXV.- 
XXXVIIL), oye 
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