29 



much uncertainty was felt as to likelihood of the infection reaching 

 the nectaries that this series and the following one were repeated. 

 (See series 16 and 17.) 



Eesult — These plants were examined March 2 and again March 31. 

 On three of them there were no symptoms whatever and on the fourth 

 there were symptoms of ill health, but none clearly attributable to the 

 inoculation. (The bulb of this plant subsequently rotted.) On June 

 18, when these plants were next examined, one of the l)ulbs had soft- 

 rotted, two appeared to be sound, and the fourth was affected with the 

 yellow disease. My notes on this particular plant are as follows- 



Notes on plant No. 6.?.— February 12, 3 p. m. Inoculated six flowers. 



February 14, noon. Bell jar removed. The fluid has disappeared from the 

 flowers. 



February 17. The flowers are still in good condition. The inoculated ones have 

 not shriveled or fallen off. 



March 2. The scape is green and healthy to its tip. There is no evidence of any 

 infection. The flowers have shriveled, but it is a normal withering. The leaves 

 are sound. They are .JO cm. long and the scape is somewhat taller. 



March 31. The leaves are healthy and there is no sign of yellowing, shriveling, 

 or down-striping in the scape, which is still green and perfect to its summit. 



June 18. Leaves dead, bulb sound externally except for a slight dry rot in the 

 extreme outer part of the plateau, which entirely disappears 1 mm. in. Consid- 

 erably farther up, the bulb shows distinct symptoms of the yellow disease, which 

 increase in the plateau from below upward. In the upper part of the plateau 

 there are quite a number of yellow bundles and several small cavities full of yel- 

 low bacteria. Near the plateau twenty-three vascular bundles in eleven scales are 

 yellowed and more or less broken down by the bacterial slime. Farther up (near 

 the top of the bulb) only sixteen bundles are visibly affected. These are close 

 together on one side of the bulb in eight scales (Plate I, fig. 5). One scale of this 

 bulb was photographed by itself and is shown in Plate I, fig. 6. 



None of the check plants showed any symptoms of this disease. On June 18 

 three of them were entirely sound, while the fourth was partly destroyed by the 

 soft white rot. 



Infection of a daughter bidh.—On the flat side of the bulb (shown 

 in Plate I, fig. 5), and still attached to it by a common plateau, was 

 a good-sized daughter bulb. This was also diseased, but only where 

 it Joined the mother bulb. In the base of its plateau there were 20 

 vascular bundles full of the yellow slime, but the upper part of the 

 plateau showed no symptoms and all of its scales were sound. 



SERIES 14 (HYACINTHS). 



This series was begun February 12 and was in all respects a dupli- 

 (;ate of the thirteenth, except that a large single, white-flowered variety, 

 known as Mont Blanc, was used. Six flowers on each of five plants 

 were inoculated and three plants in the same pot were held for com- 

 parison. 



Residt.—\J-p to March 31, at which date the observations ceased, 

 there were no symptoms on any of those plants whicli could be defi- 

 uitely ascribed to the inoculations. On June 17, wlien tiie bulbs were 



