52 



Parasitism and Iinmimii'' 



is owing to the fact that in many cases the secondary ears or later growths 

 may develop the disease, while the more advanced ears of the :-ame plants 

 are free. 



To show the methods adopted by Mr. Pye, some of the more important 

 re.sults will be given here and they will indicate clearly how far he lias suc- 

 ceeded in producing a bunt-resisting wheat. Among the numerous varieties 

 grown, there Avere several which promised to be more or less bunt-resisting, 

 and these were used as parents for further crosses, but the only one found to 

 be absolutely free this season, after the most thorough infection of the seed, 

 was Medeah. Various selections and unfixed crosses are also being tested, and 

 naturally those containing Medeah blood receive special attention. 



Out of numerous selections from various crosses, only two were found to 

 be clean after infection, apart from those containing Medeah. Ordinary seed 

 was invariably sown alongside infected seed, and only in two instances was 

 one plant found to be bunted. 



In Table II. the number of selections from each cross is given with the 

 proportion of bunted plants, and towards the end, all those crosses are recorded 

 containing an admixture of Medeah blood. 



Table II. — Selections from Crosses, with percentage of Bunt. 



No. of 

 I Selections. 



Queen's Jubilee 

 Stanley . . 



College Purple Stravr 

 Langshan x Stanley 



Langshan 

 Stanley . . 



Burton . . 

 Stanley . . 



Tripola . . 

 John Brown 



Allorite . . 

 Semi-Durum 



Langshan 

 White Fife 



Blue Heron 



Egyptian x Tardent's Blue 



Tripola . . 

 Tardent's Blue 



Tripola .. 

 Tardent's Blue 



Tripola . . 

 Tardent's Blue 



Tripola .. 

 Tardent's Blue 



Missogen 



Medeah x \Vhite Fife 



Percentage of Bunty 



Plants, varying ' 



from — 



47 to 93 



r 1 



03 „ 75 



50 „ S3 



11 „ 57 



28 



Free 



25 to 28 



Free 



6 „ 36 



6 „ 29 



16 „ 50 



