22 



artificial crossing showed no indication of the plumbeous or heliotrope- 

 purple color shown in the crossed ear. This color is rare in races com- 

 monly cultivated and is not commonly a source of impuritj^ so that the 

 writer is convinced that the effect here is due to xenia. 



Exjyerinients 26c and 26(1., two ears of Burr's White 9 X Cuzco 7a$ .— 

 (The plant of Cuzco Ta furnishing the pollen in these experiments was 

 from a yellowish-white kernel produc-cd l)y inbreeding Cuzco No. 

 700 the preceding year.) Two fairly well-tilled ears developed, all 

 the kernels of which were pure white, apparently the same iis the 

 type of the female parent used. The corneous endosperm also 

 appeared to ])e apparently the same as in the t\'pical Burr's White, 

 no effect l)eing visible here either. The fact that the Cuzco used in 

 this experiment grew from a yellowish-white kernel similar to the 

 color and appearance of Burr's White probably prevents the recog- 

 nition of any characters due to xenia. 



JExperiment 33h^ Chamjyion White Pearl 9 X Cuzco 7a $. — (Plant of 

 Ta grown from a yellowish-white kernel, as in the preceding experi- 

 ment.) A partly-tilled ear resulted, all the kernels of which were 

 white and similar to the typical Champion White Pearl, showing no 

 xenia. 



Expefriment 35a^ ChanipionWhite Pearl 9 X Cuzco No. 759 $ . — (The 

 plant of Cuzco No. 759 furnishing the pollen in this experiment was 

 from a plumbeous-colored kernel similar to those shown in PI. I, figs. 

 3 and 4.) The pollen used in this experiment was somewhat wet and 

 only a few kernels matured. Some of these were plumbeous in color, 

 similar to the color of the male parent, the color here again being 

 limited to the endosperm and doubtless due to xenia. The seed sown, 

 however, was not definiteh" known to be pure. 



ExjJeriment Jf-la^ Learning Yellmo $ X Cuzco No. 759 $ . — (Cross 

 made under the writer's direction by Mr. E. C. Rittue, at Washington, 

 in the summer of 1899.) A well-filled ear resulted, on which the 

 great majority of the kernels resembled typical Learning Yellow, 

 showing no indication of xenia. Three kernels, however, exhibited a 

 very peculiar purplish color, which apparently was derived from the 

 male parent. These three kernels, furthermore, showed the effect of 

 the cross ver}" distinctly in having a much larger quantity of soft, 

 starchy material in the endosperm, and consequently a smaller amount 

 of corneous endosperm. The other kernels on the ear were appar- 

 ently like the tj'pical Leaming Yellow in this regard, the structure of 

 the endosperm showing no effect of xenia. The seed of Leaming Yel- 

 low used was not definitel}' known to be pure. 



DENT CORN CROSSED WITH SWEET CORN. 



Experiment 11a, Hickoi^y King 9 X StmveWs Evergreen S . — A small 

 ear developed, the kernels of which were all apparently pure Hickory 

 King, showing no indication of xenia. 



