ON THE PROPAGATION OF BUNT. 



ill 



Tissue of diseased sheaths traversed by mycelium 15 days after inoculation. 



connection whatever between these and the diseased tissue. 

 There was not the slightest doubt as to the fact that the two 

 sets of wheat plants exhibited quite a different appearance ; and 

 my own observations were confirmed by several practical men 

 who saw them. It is of course incapable of proof without 

 tracing the connection of the internal mycelium with that pro- 

 duced by the spores, that the two were really derived from the 

 same origin ; but as the peculiar appearance was exhibited only 

 by the impregnated plants, there is a strong presumption as to 

 identity. All the plants were afterwards more or less infected 

 with U. Rubigo vera, which appears to be the infant state of 

 Puccinia graminis, and which afterwards was developed, and 

 there would of course then be matter of doubt to what fungus 

 any observed mycelium might belong. 



In a single instance only, ten days after the first appearance 

 of disease, in examining some little white specks which appeared 

 on the leaves of the bunted wheat, I saw a curved filament 

 passing through one of the stomata, but whether from the out- 

 side to the inside, or the contrary, I cannot say. The mycelium 

 in these white specks was not abundant, but thicker than the 

 walls of the cells. 



