. Bacteria in relation to plant diseases. Bacteria; Plant diseases. 6o BACTERIA IN RELATION TO PLANT DISEASES. fzza Greig Smith states that there is very slow liquefaction both of eane-gelatin and ordinary gelatin. This is seen usually only as a slight depression of the medium under the streak. On ordinary gelatin, according to Greig Smith, the growth is scanty and ivory white in color. By this he means, perhaps, the pale yellow of old ivory. The organism I have studied is not pure white on any medium, although for the first few days it might be thought to be so. In streak-cultures the slime s
. Bacteria in relation to plant diseases. Bacteria; Plant diseases. 6o BACTERIA IN RELATION TO PLANT DISEASES. fzza Greig Smith states that there is very slow liquefaction both of eane-gelatin and ordinary gelatin. This is seen usually only as a slight depression of the medium under the streak. On ordinary gelatin, according to Greig Smith, the growth is scanty and ivory white in color. By this he means, perhaps, the pale yellow of old ivory. The organism I have studied is not pure white on any medium, although for the first few days it might be thought to be so. In streak-cultures the slime slowly gravitates to form a yellowish-white mass at the bottom of the slant (RGS.). On glucose-gelatin the growth is less luxuriant and less deeply colored than on cane-gelatin (RGS.). There was a striking difference in the amount of growth on steamed cylinders of Com- mon Green cane and that made on Striped Green, Common Purple, and Striped Purple cane. On the first-named variety there was at least 50 times as much growth as on the others. On the last three there was little growth, while on the other growth was good though not copious. Greig Smith obtained no growth on slices of cane (variety Rappoe ?) inocu- lated with Bad. vascularum. The organism makes a much better growth on potato-cylinders and on coconut-cylinders. The growth on potato is generally better than on agar (see pi. 11, fig. 13). It is moder- ately abundant, i. e., about like that of Bad. hyacinthi, but with rather more slime in the water (fig. 36); surface growth smooth, wet- shining, and yellow (between Ridgway's canary yellow and lemon yellow), occasion- ally it is Naples yellow or between lemon yellow and gamboge yellow (3 days). The palest yellow (4 days) was between primrose yellow and straw yellow. Growth is some- times raised and restricted, sometimes flat and watery, spreading over the surface (RGS.). Growth on potato is good rather than copious, and ceases early, indicating that the organism has only
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