Popular Science Monthly/Volume 3/September 1873

Table of Contents
	PAGE
September 1873
The Glass-Sponges	529
The Constitution of Matter	547
The Great Nebula in Orion	564
Old Continents	573
Magneto-Electric Illumination	584
The Study of Sociology XIV	594
The Intellectual Powers of Birds	614
Hypnotism in Animals I	618
Tongueless Speech	627
The Late Professor John Torrey, M.D. LL.D.	632
Editor's Table	639
Literary Notices	646
Miscellany	650
Notes	655

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