BREEDING WHEATS FOR ENGLAND. 377 
rust can be eliminated by searching for types, perhaps valueless in other 
characters, but possessing this immunity. Of the problems this opens up 
to the pathologist nothing need be said here: for the present we are con- 
cerned with plant improvement, and it need only be noted that, according 
to the report of the International Phytological Bureau in 1890, the attacks 
of rust cost Germany some £20,000,000 sterling. Such figures give one 
some idea of the stakes the plant-breeder can now play for, and, thanks to 
the work of Mendel, with the reasonable certainty of winning. 
