Abstract
It will be admitted that the introduction of cytogenetical knowledge and techniques into the traditional field of presentflower breeding to make the procedure more effective and popular than in the <)rdinary methods based upon dogmatic, empirical or secret workings has been strongly influential. The, author has carried out investigations along this line for several years by means of induction or detection of the artificial and natural polyploids, mutants, etc. and under the light of cytological and genetical investigations.
