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CONTENTS. PAGE 
Modern Physical Ideas and Researches. By 
Frederick Soddy, F.R.S. -) ..cte.us) ic = 6 
The Threshold of Science—and Beyond. By Prof. 
J. Arthur Thomson. .........+++ + + 340 
Practical Mathematics . - .. . . |}. 2 = eee 
Laboratory Experiments in Aéronautics. ByR.S.B. 342 
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Work of Natural Forces in Relation to Time.—Dr. 
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The United States Territory of Hawaii.—Dr. Wm, T. 
Brigham ; Prof, J. Stanley Gardiner, F.R.S. 346 
International Conference on the Structure of 
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Magnifying Powers Used by Double-star Observers . 354 
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International Conference on the Safety of Life at 
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Agricultural Entomology in the University of Man- 
chester. (J//ustrated.) By Prof, S, J. Hickson, 
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The Passivity of Metals. .......++.+% - 356 
University Education in London .. . 356 
The Preparation of Eye-preserving Glass for Spec- 
tacles. By Sir William Crookes, O.M.,F.R.S.. . 357 
Geology at the British Association. ByA.R.D.. . 
Paleobotany: Its Past and Its Future. By Dr. 
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