298 SOIL SCIENCE [Bot. Absts., Vol. V, 



2280. Gibbs, W. M. The isolation and study of nitrifying bacteria. Soil Sci. 8: 412-481. 

 4 pi, 1 fig. 1919.— See Bot. Absts. 5, Entry 2188. 



2281. Greig-Smith, R. Contributions to our knowledge of soil-fertility. No. XVI. The 

 search for toxin-producers. Proc. Linnean Soc. New South Wales 34: 142-190. 1918. — This 

 paper is one of a series on the subject of soil toxins. In the earlier papers it was shown that 

 soil extracts sometimes contain bacterio-toxic substances. Investigations on the possibility 

 that these toxic substances are formed by bacteria, moulds and amoebae are reported. 

 These organisms were grown in various media and under varying conditions; and in all cases, 

 the signs of toxicity to the test organism Bacillus prodigiosus which became manifest could 

 be attributed to an alteration in the reaction of the media. This toxic effect was found to 

 be of a different order from that previously noted with soil extracts. — E. Truog. 



2282. Hutchinson, C. M. Report of the Imperial Agricultural Bacteriologist. Sci. Rept. 

 Agric. Res. Inst. Pusa 1918-19: 106-114. 1919. — The report summarizes investigations in 

 progress during the year under report in nitrification; nitrogen fixation; green manuring; 

 biological analyses of soils; indigo manufacture; pebrine disease of the silkworm; and sterili- 

 zation of water. — Winfield Dudgeon. 



2283. Lyon, T. L., J. A. Bizzell, and B. D. Wilson. The formation of nitrates in a soil 

 following the growth of red clover and timothy. Soil Sci. 9: 53-64. 1920. — Cylinders of soil 

 treated with dried blood, acid phosphate, potassium chloride, and ground limestone and 

 planted to timothy or clover were leached with distilled water during the period of the growth 

 of the crops and a 7 months fallow period thereafter. Twice as much nitrogen was present in 

 the drainage water from the clover pots as the timothy pots. There was little difference in 

 the quantities of nitrogen leached from the timothy and clover soils during the growth of those 

 ■crops but during the first two months of fallowing, ten times as much nitrogen was leached 

 from the clover soil as from the timothy soil. Corn and oats planted after one month fallowing 

 yielded twice as much in the clover soil as in the timothy soil. The total nitrogen in the 

 drainage water and in the corn and oats was over twice as much in the case of the clover 

 soil as in the timothy soil. — W. J. Robbins. 



2284. Miege, E. La desinfection du sol. [The disinfection of the soil.] Prog. Agric. 

 et Vitic. 74: 133-140. 1920.— A discussion of results obtained by the use of a number of anti- 

 septic substances on the yields of various plants. Generally, most of these substances have 

 increased very markedly the yields of these plants. Sulfur and copper sulfate have been 

 very efficacious on potatoes; lysol and formaldehyde were very favorable on carrots. Toluol, 

 charcoal, potassium permanganate and calcium hypochlorite have also given good results on 

 truck crops. — L. Bonnet. 



2285. Smith, T. A. J. Manures and fertilizers for tobacco. Jour. Dept. Agric. Victoria 

 17: 674-675. 1919. — The need of phosphoric acid for Victorian soils is shown. The soils are 

 naturally rich in potash, and nitrogen is secured by growing leguminous crops. Acid phos- 

 phate is recommended, applying at the rate of 100 to 200 pounds per acre. A crop of tobacco 

 yielding 1875 pounds per acre removes 65 pounds of nitrogen, 89 pounds potash and 8 pounds 

 of phosphoric acid. — J. J. Skinner. 



2286. Waksman, Selman A. Microbiological studies on the cranberry bog soils. I. The 

 effect of liming upon the microbial population of the cranberry soil. [Abstract.] Absts. Bact. 

 3 : 2. 1919. — "The addition of ground limestone, at the rate of 8000 pounds per acre, to a Sa- 

 vannah bottom cranberry bog resulted in a distinct change in soil reaction and microbial 

 flora, accompanied by a twofold increase in the crop for the four years after the lime had been 

 applied. This study was made on the fourth year after the application of lime. — The hydrogen 

 ion concentration of the unlimed soil was P H =5.2 to 5.4; the P H of the limed soil was equal 

 to 6.2 to 6.4. Ammonia was found in traces in both soils. The limed soil contained nitrites 

 and a trace of nitrates, while the unlimed soil had no nitrates and practically no nitrites, indi- 



