28 



E'.tperhncvt 10(1, Lvamhuj YeJhnr 9 x StrnvelPfi Evergre&ii $ . — A 

 fairly woU-tillod oar nuitured, all kornels of which were apparently 

 true Learning Yellow, .showing no visible signs of xenia. 



ExperlmenU 31a and Slh^ Chaiapion WAlte Pearl 9 X StoweWs 

 Evergreen. $ . — ^Two comparatively small ears developed, the kernels 

 of which were all similar to the typical Champion White Pearl, show- 

 ing no appearance of xenia. 



The writer has frequently made examinations of sweet corn and 

 dent corn grown in adjoining fields, and from observations made in 

 such cases it Avould seem that the characters of sweet corn do not 

 conmionly show as xenia in dent races. Last 3'^ear the writer had the 

 opportiniity to examine a field where about an acre of common sweet 

 corn was growing in the corner of a comparatively large field of a 

 pure yellow dent race. A careful examination was made of the 

 adjoining, row^s of dent corn, and not a single instance was found 

 where any influence of the sweet corn pollen could be observed, 

 although lumierous crosses proba1)ly existed. In the sweet corn patch, 

 however, the effect of pollen from the dent race could be abundantly 

 found, as will be explained later. In Kellerman and Swingle's' ex- 

 periments also tAvo instances of a dent race crossed with sweet corn 

 failed to give any indication of xenia. These results would seem to 

 correspond with the conclusions reached by Correns,^ who says in his 

 proposition 14 that xenia results in that a '"more complicated chem- 

 ical compound (starch) is laid down instead of a less complex one 

 ('Schleim,' dextrin), never the opposite, whereby * * * a sim- 

 pler substance is laid down instead of a more complex one." Correns, 

 laowever, did not give an account of the experiments on which this 

 conclusion was based. 



SWEET CORN CROSSED WITH DENT CORN. 



Ea^eriments 13a and 13h^ tico ears of StmoeWs Evergreen 9 X with 

 Learning YeUrnn $ . — The seed did not set well, and the kernels were 

 pressed out of normal shape owing to the comparatively small number 

 developed. They, however, clearly showed the effect of the cross, 

 in ever}' case being yellowish and smooth with a starchy endosperm 

 similar to that of the male parent. The yellow color was here again 

 limited to the endosperm, the pericarp being entirely hyaline. None 

 of the kernels showed any indication of the typical wrinkling of the 

 sweet corn. Xenia was thus shown here both in the color and com- 

 position of the endosperm, and it is further noteworthy that all of 

 the kernels developed were plainly affected. 



^Kellerman, W. A., and Swingle, W. T. Experiments in the cross-fertilization of 

 corn. First An. Rept. Kansas Agr. Exp. Sta., 1888, pp. 316-337. 

 ■^ Correns, 1. c. , p. 413. 



