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Previous Issue: Vol. 21, No. 534, Apr. 28, 1893
Next Issue: Vol. 21, No. 536, May 12, 1893
The So-Called "Sap" of Trees and Its Movements, pp. 239-241
- Charles R. Barnes
Note on the Sea-Urchin Skeletons, pp. 241-242
- Henry Leslie Osborn
The Canals of Mars, pp. 242-243
- S. E. Peal
Notes and News, p. 243
[Editorial Notes], p. 244
The Product of a Changed Environment, p. 244
- George H. Hudson
Letters to the Editor
- Variation in Native Ferns, pp. 244-245
- W. M. Beauchamp
- Singing of Birds, p. 245
- Morris Gibbs
- On a Supposed Climatic Variation in the Wing-Color of Some Orthoptera, pp. 245-246
- W. L. Distant
- A Puzzle for Future Archæologists, p. 246
- Charles B. Palmer
- Pre-Historic Remains in America, p. 246
- Cyrus Thomas
- The Lobatcheffsky Centenary, pp. 246-247
- George Bruce Halsted
- Nesting of the Road-Runner, p. 247
- Joe Grinnell
- Ad Ignorantiam, p. 247
- Edward H. Williams, Jr.
- Color in Flowers, p. 247
- F. H. Plumb
Book-Reviews
- ----------------, pp. 247-248
- Idle Days in Patagonia
- W. H. Hudson
- Review author[s]: Joseph F. James
- ----------------, pp. 248-249
- The Coal-Tar Colors, with Especial Reference to Their Injurious Qualities and the Restriction of Their Use: A Sanitary and Medico-Legal Investigation
- Theodore Weyl; Henry Leffmann
- Review author[s]: Charles Platt
- ----------------, p. 249
- Alternating Currents
- Frederick Bedell
- Review author[s]: R. A. F.
- ----------------, pp. 249-250
- ----------------, p. 250
- An Atlas of Astronomy
- Robert Stawell Ball
- Review author[s]: G. A. H.
- ----------------, p. 251
- Introduction à la Théorie des Explosifs
- M. E. Sarrau
- Review author[s]: C. P.
Back Matter (3 pp.)
Previous Issue: Vol. 21, No. 534, Apr. 28, 1893
Next Issue: Vol. 21, No. 536, May 12, 1893