Xo. 489] NOTES A XI) 1. 1 TKU. 1 T I h'l-: 603 



Held ^vlll(•ll r::u 1h" inv..k.'.l l,. (-xj.hiin tlic tads.- 



J. AHTfUK IIahkis 



Lock on Progress in the Study of Variation, Heredity and Evolution.* 



— This attnunive little voltnnc c.mtai.is iwc intv..(iu.l„rv cliai-ters on 

 the genera] concei.tioiis of cvolniiou. .mr on tl..' lUvnvy of natural 



