THE VICTORIAN NATURALIST. 51 



Port Fairy in a rusty spot, with rusty wheat growing around 

 them, and yet in no case was any effect produced upon the 

 Barberry. 



The following diagram will show the course of development 

 of the wheat rust in Europe and Australia respectively : — 



a, in Europe. b, in Australia. 



Spermatia Teleutospores 



Teleutospores 



Uredospoies 



Uredospores 

 (repeated) 



Aecidiospnres Uredospores 



As regards the method of dealing with rust in wheat and other 

 cereals, it is now generally agreed that the solution of this great 

 problem lies in judicious crossing and careful selecting. It is 

 well known that two varieties of wheat may be grown alongside 

 of each other, and one may be badly rusted, while the other is 

 comparatively free from rust, as shown in the coloured photo- 

 graphs of Rerraf and Queen's Jubilee wheats. By constant 

 selection of the best and most rust-resisting plants a strain may 

 be secured which will, for a time at least, be comparatively free 

 from rust, even in a rusty year. 



Miscellaneous. — There are some interesting points in connec- 

 tion with certain species of rusts which are worthy of special 

 mention. There is a rust found on the Marigold, which is a 

 well-known imported plant, and it is only known at present in 

 Australia, so that the question is raised whether the Marigold, 

 since its introduction, has become subject to a native rust, or has 

 the rust found upon it been overlooked in the Old World ? 



Then the imported Daisy and the Groundsel are both badly 

 attacked by rusts which have not been recorded before, and are 

 these rusts to be regarded as native ? Mr. Cheeseraan informs 

 me that the seeds of Bellis perennis are imported from England 

 and Germany, mostly the latter country, and that some nursery- 

 men here have had to give up growing the plants on account of 

 the rust. One would naturally conclude that the rust had been 

 imported with the seed, and that it may yet be found to exist 

 in the countries from which the seed has been derived. But 

 there is an undoubted native rust, found on Muehlenbeckia 

 cunninghami, which calls for more than passing notice, on 



