XVII. Account of a Craniological Collection, with remarks
on the Classification of some Families of the Hu-
man Race. By Dr SAMUEL G. MORTON,
XVIII. A Description of several extraordinary Displays of
the Aurora Borealis, as observed at Prestwich,
during the winter of 1848-1849; with Theoreti-
cal Remarks. By WILLIAM STURGEON, Lecturer
on Natural and Experimental Philosophy, formerly
Lecturer at the Honourable East India Company's
Military Academy, Addiscombe, and late Editor
of the "Annals of Electricity," &c. Communicated
by the Author,
XIX. Oceanic Infusoria, Living and Fossil,
XX. On Grooved and Striated Rocks in the Middle Region
of Scotland. By CHARLES MACLAREN, Esq.,
F.R.S.E., &c. (With a Map.) Communicated by .
the Author,
II. A Description of several extraordinary Displays of
the Aurora Borealis, as observed at Prestwich,
during the winter of 1848-1849; with Theoreti-
cal Remarks. By WILLIAM STURGEON, Lecturer
on Natural and Experimental Philosophy, formerly
Lecturer at the Honourable East India Company's
Military Academy, Addiscombe, and late Editor of
the "Annals of Electricity," &c. Communicated by
the Author. (Concluded from p. 158),
III. On a Formula for calculating the Expansion of Li-
quids by Heat. By WILLIAM JOHN MACQUORN
RANKINE, Civil Engineer. Communicated by the
Author,
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