

No. 28. IAPRIL 1913. 



Radioactivity Visualised. C. T. R. Wil» 



son, M.A., F.R.S. Illustrated. 

 Horticultural Research. III. The 



Action of Grass on Trees. Spencer 



Pigkering, F.R.S. Illustrated. 

 The Exact Determination of Atomic 



Weights by Physical Methods. F. T. V. 



Little, A.R.C.S., B.Sc Illustrated. 

 The Logic of Darwinism. Archer Wilde. 

 The Measurement ofOsmotic Pressure by 



Direct Experiment. T. Martin Lowry, 



D.Sc. Illustrated. 



The Comparative Anatomy of the In- 

 ternal Ear of Vertebrates. R. H, 

 Burne. Illustrated. 



The Projected Revival of the Flax In- 

 dustry in England. J. Vargas Eyre, 

 PhD. Illustrated. 



The State Protection of Wild Plants. 

 A. R. Horwood. 



Further Speculations upon the Origin 

 of Life. Charles Walker, D.Sc. 



The Mystery of Radioactivity. H. E. A. 



Reviews. 



THE REDUCTION OF 

 DOMESTIC FLIES. 



By EDWARD HALFORD ROSS, M.R.C.S.Eng., 



L.R.C.P Lond., 



Of the John Howard MoPadden Researches ; the Lister Institute of Preventive 

 Medicine, London ; late of the Liverpool School of Tropical Medicine ; 

 and sometime Health Officer, Port Said, the Suez Canal District and Cairo. 



Author of " The Reduction of Domestic Mosquitos." 



With Illustrations. Demy 8vo. 5s. net. 



"The deadly peril to the community of the common house-fly cannot be 

 properly realised until one has read Dr. E. H. Ross's remarkable volume." 

 — Daily Express. 



"■ No one can read this book without being impressed by the importance 

 of the subject with which it deals, nor, we may add, without recognising the 

 industry and ability which the author has brought to bear upon it. It is the 

 last word in scientific fly-warfare." — The Globe, 



JOHN MURRAY, ALBEMARLE STREET, W. 



Scale off Charges for Advertising in " Science Progress." 



Whole Page 

 Half Page 

 Quarter Page - 

 Eighth Page 



All applications tor space to be made to 



Mr. JOHN MURRAY, 50a, Albemarle Street, W. 

 or to 



Mr. H. A. COLLINS, 32, Blrdhuret Read, Croydon 



( xi-ii : ) 



