MAKING NEW KINDS OF PLANTS 447 



has been sown, the origin of the Broad Evening 

 Primrose from it has been observed. It is possible 

 to identify this and other new species in the seedling 

 stage. Fig. 250 shows the difference in the appear- 

 ance of the seedlings of (Enothera Lamarckiana and 

 (Enothera lata; while the strikingly small and pale 



250. Mutations obtained by sowing seed of Lamarck's Evening 

 Primrose. Typical Lamarck's Evening Primrose on the 

 left, Pale Evening Primrose in the middle, and Broad 

 Evening Primrose on the right. 



leaves of (Enothera albida, another of the new species, 

 contrasts with both the other two species. Most of 

 the other new species (of which there are several) 

 can be identified in the seedling stage; so that they 

 can be early transplanted and isolated from each 

 other. This greatly facilitates the handling of the 

 specimens, and makes it possible to deal with much 

 larger numbers than would otherwise be the case. 



Professor de Vries' ideas may be well illustrated 

 by means of his experiments on the Red Clover. 

 Every one knows that four- and five-leaved Clovers are 

 found occasionally. Beginning with a plant which 



