MAKING NEW KINDS OF PLANTS 453 



pected, and furthermore raise the important question 

 whether we can control evolution and so produce 

 species at will. Some experiments already made in 

 this direction are very encouraging and open up a 

 promising field of research.^ 



1 In regard to the work of Professor de Vries, consult: de Vries, "On the 

 Origin of Species," Popular Science Monthty, April, 1903; "My Primrose 

 Experiments," Independent, Sept. 25, 1902; "On Hybridization," in Bailey's 

 "Plant- Breeding" third edition, 1904, p. 189. Also Hubrecht, "Hugo de Vries' 

 Theory of Mutations," Popular Science Monthly, July, 1904; MacDougal: 

 "Professor de Vries' Experiments on the Origin of Species," Independent, 

 Sept. 25, 1902; Lyle, "Plant -Making in a Dutch Garden," Everybody's 

 Magazine for June, 1902; MacDougal: "Mutation in Plants," American 

 Naturalist for 1903. 



