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Science, New Series, Vol. 80, No. 2086, Dec. 21, 1934


Previous Issue: New Series, Vol. 80, No. 2085, Dec. 14, 1934
Next Issue: New Series, Vol. 80, No. 2087, Dec. 28, 1934


Front Matter (3 pp.)
Environments, pp. 569-576
Burton E. Livingston

Local Branches of the American Association for the Advancement of Science, pp. 576-578
J. McKeen Cattell


Obituary
Theobald Smith, pp. 579-580
Charles R. Stockard
Recent Deaths, p. 580


Scientific Events
Bird Sanctuary in New York City, p. 580
E. D. Merrill
Ornithological Expedition from Cornell University, pp. 580-581
Exhibition and Publications at the Carnegie Institution of Washington, p. 581
The Annual Meeting of the American Physical Society and the Section of Physics, pp. 581-582
Work of the Science Advisory Board, pp. 582-583


Scientific Notes and News, pp. 583-586


Discussion
Misconceptions Relative to the Mineral Composition of Plants, p. 587
Walter Thomas
The Acid-Base Equilibrium in Sea Water, pp. 587-588
Laurence Irving
Host Responses to Haustorial Invasion of Cuscuta Species, p. 588
H. L. Dean
Bohemium--An Obituary, pp. 588-589
Max Speter


Scientific Books
A History of French Scientific Societies, pp. 589-590
Scientific Organizations in Seventeenth Century France (1620-1680)
Harcourt Brown
Review author[s]: Charles A. Kofoid
Theoretical Physics, p. 590
Introduction to Theoretical Physics
J. C. Slater; N. H. Frank
Review author[s]: Leigh Page


Reports
The Second Annual Tri-States Geological Field Conference of the Upper Mississippi Valley, pp. 591-592
W. H. Twenhofel


Scientific Apparatus and Laboratory Methods
A Physiological Stroboscope, p. 592
Leo A. Kallen; H. S. Polin
Dissection as a Method of Embryological Study, p. 592
J. A. Long
The Development of the Principal Arterial Vessels in the Rat from 11 to 16 1/2 Days, pp. 592-593
Mary Sanford Leitch
The Removal of Fluorides from Water by Sand Filtration, p. 593
S. P. Kramer


Special Articles
Rare Gases Not Essential to Life, pp. 593-594
Alvan L. Barach
Chromosome Structure in the Salivary Glands of Sciara, pp. 595-596
C. W. Metz; E. H. Gay
Demonstration of the Existence of Two Forms of Vitamin D in Fish Liver Oils, p. 596
Charles E. Bills; O. N. Massengale; Miriam Imboden


Books Received, p. 596
Science News, pp. 6a+8a+9a
Back Matter (3 pp.)

Previous Issue: New Series, Vol. 80, No. 2085, Dec. 14, 1934
Next Issue: New Series, Vol. 80, No. 2087, Dec. 28, 1934



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