CONTKIBUTIONS FEOM THE WISLEiT LABORATORY. 215 



would therefore be well to avoid growing the plants in places where it 

 has occurred in the previous year. Although it has not so far been 

 directly proved that the disease is conveyed in the seed, it would be best 

 not to save seed from affected plants, particularly as the commercial 

 " seed " is not only the seed proper, but is surrounded by a part of the 

 old plant on which the fungus may often be found growing. Several 

 of the plants recently examined showed pustules of the fungus, not only 

 upon the flower, stalks, and calyx, but also upon parts of the ovary itself. 

 If the mycelium should prove itself capable of withstanding the drying 

 the "seed" undergoes, the source of infection is thus conveyed in the 

 " seed." Even if this were not the case, it would be quite impossible, 

 unless the " seeds " were treated with some disinfectant, to guarantee 

 them free from adherent spores of the fungus which might well survive 

 the winter and propagate the disease in the following season. 



