110 Agricultural Experiment Station, Ithaca, N. Y. 



son and Yellow Transparent. The Newman is tlie most generally 

 known and this is hardy in central New York. The Chiclcasaws 

 are best adapted to the central and southern States. ]\lany of 

 them are not hardy in Michigan and New York. 



15. The Marianna and De Caradeuc constitute a distinct class 

 or group of plums, and the Hattie is evidently allied to them. 

 They are to be associated with the myrobalan plum. Ue Cara- 

 deuc is probably myi'obalan, and Marianna appears to be a 

 hybrid. The history of the myrobalan is obscure, but it is clearly 

 of Old World origin. It is largely used as a stock, and there are 

 varieties grown for fruit. 



16. The Marianna has assumed great importance because of its 

 use as a stock for many plums and allied fruits. Its mm-its aie 

 the ease with which it growls from cuttings, iind the facility with 

 which it unites with other species. 



17. The beach plum or Prunus maritima, of the Atlantic coast, 

 is in cultivation both for ornament and for fruit. As n fruit 

 plant it is represented only in Bassett's Amc^rican, a frr.it of 

 little value. 



18. The Pacific wild plum, Prunus subcordata, was introduced 

 to cultivation in 1889, as a possible fruit plant, but its merits are 

 not yet determined. 



19. Hybrids appear to occur between the Wild CSoose jmd the 

 peach. J. W. Kerr, of Maryland, has produced such a liybrid, 

 and the so-called Blackman plum appears to be another. 



20. Some varieties of native plums, notably Wild Goose and 

 Miner, are not fertile with themselves, and this fact has undoubt- 

 edly retarded the progress of native plum culture. This infcM'tility 

 is due to comparative impotency of pollen upon llowers of the 

 same variety rather than to any structural imperfection in the 

 flowers themselves. 



21. Tliis infertility is avoided by mixed planting, by means of 

 which foreign pollen is supplied to the impotent varieties. <.'nre 

 should be taken to associate varieties which bloom at the same 

 time, and with this precaution the ordinary i nixed or alternate 

 planting, at usual distances, appears to be successful. 



22. The best stocks for native plums are probably seedling of the 

 same species, although they grow well, as a rule, upon related 



