10 



blackish mass in 6 Jays from the time of inoculation. Fig. 4 is a 

 photograph of this plant on the fifth day, the whole fiower mass hav- 

 ing dropped and turned black. 



No. 3 showed no signs of disease even after fourteen days. 



N. B. — No water was syringed on the flower of this plant. 



The cheek plants were syringed every day and remained 

 absolutely healthy. 



Summary : These experiments seem to show that, provided 

 sufficient moisture is pre.sent on the interior of the flower of the cauli- 

 flower, infection by Bacillus oleraceae can and does take place. If 

 small portions of the rotted tissues were placed upon the flower of 

 healthy plants, infection took place, in spite of the mechanical resist- 

 ance of the cuticle and epidermal cells. Many plants, under field 

 conditions, were found with the flower alone infected. 



Series VIII. 



In this series three healthy white turnips (Greystone variety) 

 were inoculated at the crown with two needle punctures. A check 

 plant wa3 treated in a similar m inner, bit with a sterilized needle. 



Nothing was noticeable for two days ; but on the third day, a 

 small drop of water was exuding from each puncture of the inoculated 

 plant and on the fifth day, rotting to a depth of 5 m.m. had taken 

 place. In 14 days, the plants were dead. Fig. 8 is a photo of one of 

 these plants 9 days after inoculation. 



The check plant remained perfectly sound and healthy. 



Subsequently the experiment was repeated, with the same results. 

 Fig. 6 shows the extent of the rotting process, 6 days after inoculat- 

 ing with one needle puncture while Fig. 7 shows the most complete 

 rotting 10 days after inoculation. 



The Greystone turnip in all the inoculations was very susceptible 



to this disease. 



Series IX. 



Three healthy Swede turnips were inoculated at the crown with 

 two needle punctures. A check plant wa? treated in a similar manner ; 

 but the punctures were made with a sterilized needle. 



Two days after inoculation, there was a slight softening of about 

 2 m.m. in diameter around the puncture. In five days the area was 

 only slii^htly larger and there was no further increase of the disease ; 

 although the plants were kept under observation for three weeks. 



