396 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



obtained in 191 2, as there were several crosses attempted which 

 were sterile but of which no complete record was kept. In table 9 

 the fertile combination exceed the sterile, being 26 to 17; in the 

 other tables, each of which relates to pedigreed stocks, the sterile 

 crosses exceed the fertile and agree in the general results for all 

 crosses. 



The total number of reciprocals made is 47, of which 15 were 

 both fertile, 18 were both sterile, and 14 gave a different result. 

 The latter have already been summarized in table 10. 



The total number of flower heads concerned in the cross-pollina- 

 tion reported is 2,168, which in\olve about 40,000 individual 

 flowers. 



The total number of heads upon which the results of controlled 

 self- and cross-pollinations were fully recorded is 6,261. All of 

 these pollinations were made by the writer with the exception of 

 the pollinations made by Mr. A. C. Fraser, who continued the 

 experiments during six weeks of the summer of 1914 while the 

 writer was absent from the New York Botanical Garden. In all 

 of the pollinations, excepting those made in 191 2, the writer was 

 assisted by a second person. Mr. A. C. Fraser assisted in this 

 work during the season of 1913, and Mr. Charles Holste has 

 assisted during the seasons of 1914 and 1915. The writer wishes 

 to record here his appreciation of the assistance thus given. 



GENERAL OR POTENTIAL F'ERTILITY IN CHICORY 



As the chicory plants grow in my experimental plots and wild 

 about New York and especially at Madison, Wisconsin, where the 

 writer has seen them in considerable numbers, there is no obvious 

 suggestion of sterility of any sort. Neither is there such an 

 indication from the conditions in the fields grown for seed pro- 

 duction which the writer saw in 1914 in the grounds of the Dippe 

 Brothers at Quedlinburg and of Ernst Benary at Erfurt, Germany. 

 The gardeners in charge of chicory-growing for these firms had 

 no idea that sterility of any but the most accidental sort is present 

 in this species. All plants seem to set an abundance of seed. 

 In any package of commercial seed, howe\cr, from the writer's 

 exj^ericnce, there arc many light-colored and shrunken seeds that 

 fail to germinate. 



