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Edwin F. Hopkins 



from foreign sources and seven from domestic, showed thirty-eight in- 

 fections out of forty when pricked with a needle after inoculation, and 

 forty out of forty-seven when not injured in this way. 



A summary of the results obtained from inoculating tulip leaves with 

 mycelium is given in table 3. All seven leaves showed infections when 

 inoculated and injured; of the uninjured leaves, eleven out of fourteen 

 showed infections. 



Tulip flowers were inoculated with mycelium, with results as given in 

 table 4. The tulip flowers, like the leaves, were all seven infected when an 

 injury was made at the point of inoculation. Out of fourteen not so 

 injured after inoculation, twelve showed infections. 



TABLE 4. Results from Inoculating Tulip Flowers with Mycelium 



* The arabic numerals represent cultures from domestic sources, and the roman numerals, those of 

 foreign origin. 



It should not be deduced that the lower proportion of infections in 

 the uninjured leaves, stems, and flowers was owing to the inability of 

 the fungus to penetrate uninjured tissue. The writer attributes it rather 

 to experimental error; for the inoculum was more likely to be lost or 

 dried out before infection had opportunity to take place than when it 

 was placed at once in such intimate contact with the host tissue as was 

 the case when the latter was injured. 



On April 3, 1917, six dormant bulbs were dusted with conidia from 

 a pure culture of strain B. XXVII, and by April 25 five of these were 



