CONTENTS: OF No. XLIV. 
I; An Examination of the Theories that have been Proposed 
to Account for the Climate of the Glacial Period. 
II. Loss of Life at Sea. 
III. The Lunar Atmosphere and its Influence on Lunar — 
Questions. 
IV. Beryls and Emeralds. 
V. On the Curved Appearance of Comets’ Tails. 
* 
NOTICES OF SCIENTIFIC WORKS. 
Chappell’s ‘* History of Music.” 
West’s ‘The Harveian Oration for 1874.” 
Brown’s *‘ Divine Revelation, or Pseudo-Science ?” 
Grove’s “‘ The Correlation of Physical Forces.” 
Proétor’s ‘The Universe and the Coming Transits.” 
Lardner’s “*‘ Handbook of Natural Philosophy.” ; 
Richter’s “‘ Plattner’s Manual of Qualitative and Quantitative Analysis” 
with the Blowpipe.” 
Allan’s ‘*‘ Theory of Arches.” 
Bonney’s “‘ Geology.” 
‘Fourth Annual Report of the Board of Commissioners of Public 
Charities of the State of Pennsylvania.” 
Rutley’s ‘* Mineralogy.” 2 
Goodeve’s ‘‘ Principles of Mechanics.” 
Phillips’s ‘‘ Elements of Metallurgy.” 
Girard’s ** Le Monde Microscopique des Eaux.” 
PROGRESS IN SCIENCE, 
(Including the Proceedings of Learned Societies at Home and Abroad, and =F 
Notices of Recent Scientific Literature), mee’ 
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