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Previous Issue: New Series, Vol. 71, No. 1846, May 16, 1930
Next Issue: New Series, Vol. 71, No. 1848, May 30, 1930
Front Matter (4 pp.)
The Universe as a Whole, pp. 519-527
- A. S. Eve
Obituary
- William Henry Nichols, p. 528
- Arthur E. Hill
- J. Arthur Harris, pp. 528-529
- Royal N. Chapman; Ross Aiken Gortner; Richard E. Scammon; Frank K. Walter; C. Otto Rosendahl
- Recent Deaths, p. 529
- Memorials, p. 529
Scientific Events
- The American Engineering Council and Aviation, p. 530
- State Appropriations for Cornell University, pp. 530-531
- The University of Mexico and Dr. Holland, p. 531
- Honors Conferred by the Franklin Institute, pp. 531-532
Scientific Notes and News, pp. 533-536
Discussion
- The Tau Effect--An Example of Psychological Relativity, pp. 536-537
- Harry Helson
- On the Age of the New Albany Shale, p. 537
- T. E. Savage
- Fireflies Flashing in Unison, pp. 537-538
- Carl A. Richmond
- Pressure in a Fluid, p. 538
- H. H. Marvin
- Laws of Orbital Motion, p. 538
- A. F. Dufton
Special Correspondence
- Barro Colorado Island Biological Station, pp. 538-539
- Vernon Kellogg
Scientific Apparatus and Laboratory Methods
- An Electrical Recording Manometer, pp. 539-540
- Richard H. Fitch; Arthur L. Tatum
- Plant Juice Clarification for Nitrate Nitrogen Determinations, p. 540
- H. H. Hill
Special Articles
- The Isolation of Nitrosomonas and Nitrobacter by the Single Cell Technique, pp. 541-542
- D. H. Nelson
- The Boron Content of Oranges, pp. 542-543
- Carl S. Scofield; L. V. Wilcox
The National Academy of Sciences. II, pp. 543-546
Books Received, p. 546
Science News, pp. x+xii+xiv
Previous Issue: New Series, Vol. 71, No. 1846, May 16, 1930
Next Issue: New Series, Vol. 71, No. 1848, May 30, 1930