SCIENCE PROGRESS 



A QUARTERLY REVIEW OF 

 SCIENTIFIC THOUGHT, WORK & AFFAIRS 



No. 56. APRIL 1920 

 CONTENTS 



BBCENT ADVANCES IN SCIENCE: Philosonhv <w irnwi 



w$?cai% 1 e1 a & 



Chemistry (P. Haas, D.Sc.)-Geolog5 (fa W \SSSh nfJS.S 

 <E. J. Salisbury, D.So.)-Plant Physlolisy flTKMd hlftto?* 



p. 533 

 (M^J L o? S A T B e SSw tt ^ A°p M rA etiS n m o t0 , the Cpystaiiine State 



™ AasMlia % P % H P T M l3 1 , oal SJsoovepy - science Masters' 



p. 635 



p. 655 



BS J^»S.Y I ^ S l i ¥> slc and Mathematics (the late P. E B 

 JouPdain)-The Palaeontologieal History of the Gymnospfrms 



p. 669 

 noSSSWS^j&^ST" "W-toUwr-*** Feeding 



EDITOR 



SIR RONALD ROSS, K.C.B., K.C.M.G., F.R.S., NX. 



ASSISTED BY 



D ORSON- WOOD, M.Sc, A.R.C.Sc, and 

 J. BRONTE GATENBY, B.A, B.Sc. 



LONDON : JOHN MURRAY, ALBEMARLE STREET, W. 



VOL. XIV 



Price 6/- net 



