146 



CKOWN-GALL OF PLANTS. 



Table Ylll.— Showing behavior « of crown-gall organisms on starch jelly at room 



temperature. 



[Transfers from 5-day-old agar cultures.] 



o Explanation of figures indicating growth: l=scant; 3= moderate; 4= good; 5=copious. 



6 Diastasic action feeble or absent. A brownish stain mixed with the white. In cotton the original 

 streak is brownish, but the young growth pushing out to either side of the old is white. In old rose the 

 base of streak is white, upper three-fourthsis brownish, but beyond the brown the new growth is white 

 The margin of old daisy streak is also whitish. 



cOld daisy, old rose, peach, and cotton lock alike — decided browning of the slime in each case, and a 

 paler (brown) staining of the body of the jelly. No diastasic action and not a very copious growth. The 

 margin of streak in cotton and base in old rose, which were white at end of 8 days are now brownish, 

 while the older portions have become dark brown. 



d No indication of any diastasic action. Purest white growth is that shown by alfalfa. 



«No diastasic action; only slight increase in growth. A little increase in color toward cream, and in 

 grape toward brownish. 



/ Diastasic action absent or scanty. More color in slime which approximates a pale cream. 



ff.Vbundant salmon-colored growth which has run down and filled the V. On plating out a pinkish 

 intruder was discovered. 



A In Flats poi)lar, recently tested on sugar beet and found to be virulent, there was at the end of 30 days 

 a decided brownish stain throughout the medium (Ridgway's drab to drab gray). 



213 



