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Since Johannsen (1903) (2) first expounded his theory of "pure lines " in genetic problems, investigators in all branches of this type of research have come to realize the importance of having stocks of plants or of animals, the genetic constitutions of the individual members of which are as homogeneous as it is possible to make them. I n plants the procedure followed in the establishing of such a homogeneous race is relatively simple, the ovum of the plant being fertilized by pollen from thedoi:10.1126/science.66.1720.600 pmid:17810393 fatcat:vyn6cllpd5cxxemso45gahql6q