X. Account of Observations on the Solar Eclipse of July
28, 1851, made at Sebastople. By EDWARD
SANG, Esq., F.R.S.S.A., Professor of Civil and
Mechanical Engineering, Constantinople. Com-
municated by the Royal Scottish Society of Arts, 103
XI. On the Scratching of Rocks by the passage over them
of Sharp Detrital Matter. By Lieut.-Colonel
PORTLOCK, F.R.S., President of the Geological
Society of Dublin,
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