10-0] - HORTICULTURE. 541 



first crop of fruit from tho Fi sci'dliiij^s of crosses Jiiiioiig commorcial varieties 

 of peaches. Tile data are preseiiled at tiiis sta^c priinarily for tlie beiietit (»f 

 other \vori<ers aioiij; the same line rather than to formulate delinile conclusions. 

 The j,'eneral results are sunnnarizcnl as follows: 



'• Kllierta carries white llesh as a recessive character to the extent of about 

 one-third. It sihmus prei»oti'nt with respect to ripening; i)eriod. Its character 

 for (piality is oidy mediocre. I'.elle is strongly white, but seems to carry a 25 

 per cent character for yellow. It is prepotent with re.spect to viR()r and quality 

 and carries a factor for clinj^lness of about 25 per cent. Early Crawford is 

 almost pure yellow. Its character for quality seems donnnant, as does its 

 character for freestone. Creensboro seems to be pure white, is clinj^stone, but 

 carries a small factor for freestone. White on yellow gives increased vigor. 

 While .seems to be dominant over pure yellow in the Fi generation." 



In addition to the correlation of green calyx cup with white fleshed fruit 

 and of orange calyx cup with yellow fleshed fruit, as noted by Hedrick (E. 

 S. U., 29, p. 424), the author observed an intermediate type in which the calyx 

 cup is yellowish buff and the fruit white fleshed, but the variety carries a 

 character for yellow flesh, as was the case with Belle. A correlation was also 

 observed between the dark green leaves and white fleshed fruit and between 

 normally yellowish leaves and yellow fleshed fruit. In this connection, liow- 

 ever, the leaf veins should also l)e examined. When the midrib and veins of the 

 leaves have a yellowish cast the fruit is yellow, and when the midribs and veins 

 are a pale green or whitish the fruit will be white. 



Inter species pollination of x)lums, A. H. Hendhickson {Vroc. Amcr. Soc. 

 Hort. Sci., 16 (1919),, pp. 50-52).— A contribution from the University of Cali- 

 fornia. The data given deal with the interpollination of two varieties of 

 Prunus (lomcstica (Reine Claude and German Prune), and one variety each of 

 r. tripDra (P.urbank) and P. insitiiia (Shropshire). The observations were 

 conducted in the orchard at Cornell University during the spring of 1919. 



As far as the varieties tested were concerned, there was no evidence of 

 sterility existing between P. triflora and P. donicstica or between P. domestica 

 and /'. iufiititia. Burbank and German Prune gave evidence of being self- 

 sterile; Reine Claude and Shropshire were evidently self-fertile ; Burbank and 

 Reine Claude were interfertile ; and likewise Reine Claude, German Prune, and 

 Shropshire were interfertile. 



Report of three years' results in plnni pollination in Oregon, R. E. Mak- 

 suAUh (Pror. Amcr. Hoc. Hort. Hci., 16 {1919), pp. 42-49, pis. 2).— A contribu- 

 tion from the Oregon Agricultural College. Tabular data are given and dis- 

 cussed, showing the results of self-pollination of plums, cross-pollination with 

 varieties of Prtniiis (lonicstica, and interspecies pollination. 



-\niong the results noted, pollen of the varieties of P. domestica and of P. 

 tri/lora appeared to germinate best in a solution of 5 per cent of cane sugar 

 and 2 per cent gelatin. With a normal bloom, generally speaking, one flower 

 In 5 should set to produce a full crop, although in some cases, one flower in 

 20 is sulhcient. Thirteen out of 23 varieties tested were evidently self-sterile, 

 but the varietie.s of P. domestica may be considered interfruitful. Blue Damson 

 was decidedly self-fruitful, and Italian and Petite partially so. These two 

 varieties are good poUenizers for practically all varieties of P. domestica tested. 

 The important point, however, is to interplant varieties that bloom at the same 

 time. 



Some varieties are actually commercially profitable where no pollenizers are 

 used. In such varieties as Bavay, Blue Damson, Giant, Green Gage, Pond, 

 Quackenboss, Red Magnum Boinmi, Teimant, and Tragedy the fruit may 

 mature regardless of complete seed development. There appeared to be no 



