Wakker's hyacinth germ, Pseudomonas hyacinthi (Wakker) . ). The fourpotato cultures were alike at first and three continued to be homogeneous, whilea pink organism appeared in the fourth tube at the end of the second day. A fewgas bubbles also appeared in each of the tubes. This particular hyacinth plant was a robust Czar Peter in full bloom, with along stocky scape. The rapidity of the rot may be judged from the fact thatwhen the disease was first discovered it involved only one flower. In forty-eighthours the scape was soft-rotten (and lopped over) from the point of infectionnearly to the bu
Wakker's hyacinth germ, Pseudomonas hyacinthi (Wakker) . ). The fourpotato cultures were alike at first and three continued to be homogeneous, whilea pink organism appeared in the fourth tube at the end of the second day. A fewgas bubbles also appeared in each of the tubes. This particular hyacinth plant was a robust Czar Peter in full bloom, with along stocky scape. The rapidity of the rot may be judged from the fact thatwhen the disease was first discovered it involved only one flower. In forty-eighthours the scape was soft-rotten (and lopped over) from the point of infectionnearly to the bulb (10 or 15 centimeters) and also 3 to 5 centimeters above thepoint of entrance—i. e., to within a few centimeters of the top of the was a soft wet rot, involving all of the tissues in a general collapse of slimewhich was strongly alkaline. Another fact worthy of note is that this organismis quite tolerant of acids. That we have here a genuine bacterial disease of the hyacinth, worthy of carefulstudy, admits of no doubt whatever. 22. Fig neighboring bundle. ground parts of each of the eight other inoculated plants, and pro-gressed slowly in the usual way. The notes upon plant l^o. 25, givenbelow, Avill answer for all. On June 14 the bulbs of these plants wereexamined. One was free from bacterial infection so far as could bedetermined b} careful cutting and microscopic examination. One wasrotted and gone, as already noted. The six other bulbs were soundexternall}^ but, within, each one showed distinct sj^mptoms of disease—i. e., there were few to many yellow bundles full ofbacteria in otherwise sound scales. In mostcases the plateau was also involved. Generallythe yellow disease was closeh restricted to indi-vidual bundles, the parenchyma between thembeing sound. In several cases, however, smallbacterial pockets had formed in the paren-chyma around a bundle; in one case all of theparenchyma between two neighboring bundleswas yellow; rarely, some
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