:m i mum mm u warn* aias 



IN THE TWENTIETH CENTURY 



A QUARTERLY JOURNAL OF 

 SCIENTIFIC THOUGHT 



EDITORS 



N. H. ALCOCK, M.D. 

 W. G. FREEMAN, B.Sc, F.L.S. 



VOL. I 



LONDON 



JOHN MURRAY, ALBEMARLE STREET, W. 



1907 



