SCIENCE PROGRESS 



IN THE TWENTIETH CENTURY 



A QUARTERLY JOURNAL OF 

 SCIENTIFIC WORK AND THOUGHT 



NO. 33. JULY 1914 



CONTENTS ^y//^ 



1. Irrationalism. Nkjl^s? / ^&//s » 



2. The Temperature of Mars. P. H. Ling. **' 



3. The Terrestrial Distribution of Radium. A. Holmes. 



4. The Birth-Time of the World. Prof. J. Joly, F.R.S. 



5. Sea- Salt and Geologic Time. H. S. Shelton. 



6. Igneous Rock Classification. G. W. Tyrrell. 



7. The Cause of Variation. A. D. Wilde. 



8. The Awakening of Pond Life in the Spring. A. H. Drew. 



9. Scientific Research and the Sea Fisheries. Dr. J. T. Jenkins. 



10. Some Recent Work on Plant Oxidases. W. R. G. Atkins. 



11. Plant Chimaeras. M. Skene. 



12. Coloured Thinking and Allied Conditions. Prof. D. Fraser Harris. 



13. Photographic and Mechanical Processes in the Reproduction of 



Illustrations. R. Steele. 



14. Proposed Union of Scientific Workers, and other Notes. 



15. Twenty Reviews. 



EDITOR 



SIR RONALD ROSS, K.C.B., F.R.S., N.L., 

 D.Sc, LL.D., M.D., F.R.C.S. 



LONDON 

 JOHN MURRAY, ALBEMARLE STREET, W. 



Price 5/- net 



VOL. IX 



