1890-91.] PEACH YELLOWS. 2li> 



the gelatine involved in the colony has become liquid, forming a 

 funnel-shaped liquefaction in which fine particles are suspended, and 

 some slight collection of these at the bottom of the funnel. Rest of the 

 gelatine remains clear. Gradually the whole tube becomes involved, and 

 at the end of 40 days all the gelatine is liquefied. It is cloudy with fine 

 granules, and a precipitate of same nature. 



Bouillon. — Grows at first as a simple haziness throughout the medium^ 

 but later a strong, tenacious whitish growth occurs on the surface, which 

 is broken up by much shaking, and partially sinks. 



Potato. — After four days whitish, thin, flat growth, inclined to a slight 

 tinge of pink. Surface smooth but dry, and not glistening. Grows 

 slowly. After two weeks it has gradually become brownish and appa- 

 rently granular, but which, on close examination, shows it to be very 

 finely wrinkled. Potato substance turns dark brown. Edges of colony 

 are smooth and glistening, and the whole surface glistening. 



Tetnperatitre. — Grows at ordinary temperature. 



Spore formation. — Some spores seen, being generally two to each 

 bacillus, round, clear and oval, and not placed in any particular part of 

 Bacillus. 



Color. — White growth except on potato, where it becomes brownish 

 after some time. 



Gelatine. — Exceedingly slow liquefier, and growth is also very slow. 



'It therefore remains to be proved by inoculation experiments into the 

 trees, and contamination of the flowers and of the soil, which one of the 

 three forms is the cause of yellows, or if each one will produce a diseased 

 condition of the trees so experimented uath, and I hope at some future 

 date to be able to lay before the Canadian Institute the results of such 

 investigations. 



Granted that the disease be due to a specific organism, then it behooves 

 this Institute to instigate a movement for a government power to be 

 granted to properly qualified persons to adopt means for the destruction 

 of affected trees, and the isolation in some manner of the diseased 

 orchards. And if laws stringent enough be passed, it is in my opinion 

 possible to stop the spread of a disease, which, if not soon controlled, will 

 remove from the Niagara peninsula a most profitable industry. 



Again, the appointments of inspectors should be so managed that com- 

 petent men should receive them and persons who will not have too much 

 to inspect, and hence imperfectly perform their duties, and also the 

 remuneration should be sufficient to make it worth their while to 



