728 The American Naturalist. [September, 
goes on, the turbidity becomes greater, and again decreases 
until at the end of nine or ten days, when growth practically 
ceases, the liquid becomes clear, and a grayish sediment falls 
to the bottom of the tube.” 
No statement as to whether the sugar in this solution was 
broken up with the formation of an acid. 
(8) Relation to Free Oxygen.—No statement. Certainly not 
anaerobic, from the ease with which cultures were obtained. 
(9) Reducing and Oxidizing Power.—No statement. 
(10) Fermentation Products and other Results of Growth : 
(a) Gas Production—No statement. 
(b) Formation of Acids.—No statement. 
(c) Production of Alkalii—Neutral or acid gelatin becomes 
alkaline. In view of this statement it would be interesting to 
know whether the juice from diseased roots is alkene or less 
acid than that from healthy roots. 
(d) Formation of Pigment.—Old cultures on gelatin are pale 
yellow. 
(e) Development of Odors.—No statement. 
(f) Enzymes.—Gelatin is finally liquefied. 
(g) Other Products—No mention of any. 
(11) Effect of Dessication—No statement. 
(12) Thermal Relations : 
(a) Maximum for Growth—Not determined. 
(b) Optimum for Growth—Not determined. 
(c) Minimum for Growth—Not determined. 
(d) Death Point.—Not determined. 
(13) Relation to Light—No statement. 
(14) Vitality on Various Media—Not recorded. 
(15) Effect on Growth of Reaction of Medium (acid, neutral, al- 
kaline). Liquefaction of gelatin delayed by acidity. 
(16) Sensitiveness to Antiseptics and Germicides.—No statement. 
(17) Other Host Plants—None recorded. 
(18) Effect Upon Animals.—No statement. 
(III) Economic ASPECTS: 
(1) Losses—*“A source of danger to the beet sugar industry 
of no inconsiderable moment.” See also (I) (2). ; 
