FEETILIZERS. 131 



ous commercial sources of nitrogen, phosphoric acid, and potash, and the valuation 

 of fertilizers; and reports analyses of 528 samples of fertilizing materials, including, 

 besides various mixed fertilizers, acid phosphate, cotton-seed meal, tankage, dried 

 blood, ammonium sulphate, nitrate of soda, bone meal, kainit, sulphate of potash, 

 potassium carbonate, muriate of potash, and silicate of potash. 



The treatment of dead animals and abattoir refuse with sulphuric acid, A. 

 Pagnoul {IJEngrais, 15 {1900), 'So. S5, jyp. 589-591). — The process first described by 

 Miintz and Girard^ is discussed with reference to its sanitary value and as a means 

 of preserving a large amount of valuable fertilizing material which now goes to 

 waste. 



Results of fertilizer experiments with sulphate of ammonia, Kloepfer 

 {Fithling's Landiv. ZUj., 49 {1900), Nos. 10, pp. 376-384, figs. 3; 11, pp. 396-406, figs. 3; 

 12, pp. 436-445, figs. 2). — For notes on. previous articles by the author on this subject 

 see E. S. R., 10, pp. 533, 848. 



Fertilizer experiments with sulphate of ammonia and nitrate of soda, 

 Kraus {FuhUng's Landw. Ztg., 49 {1900), Nos. 6, jjp. 232-237; 7, pp. 256-259).— In 

 2 years' experiments with barley grown on loam soils, sulphate of ammonia and 

 nitrate of soda gave the same increase when applied at the same time (incorporated 

 in the soil or applied as a top-dressing at time of planting), but Avhen the nitrate was 

 applied at a later date it gave a greater increase than the earlier application of 

 sulphate of ammonia. 



The nitrate of soda industry in Chile, AV. Newton {Jour. Soc. Chem. Ind., 19 

 {1900), No. 5, pp. 408-417, figs. 8). — This article describes the region in which the 

 nitrate is found; discusses the causes of its formation, its composition, exploitation, 

 and preparation for the market; and gives statistics of exportations. The exporta- 

 tions amounted to 1,355,360 tons in 1899, as against 1,003,340 in 1890. 



Liime and its uses in agriculture, A. P. Aitken {Jour. Jamaica Agr. Soc, 4 

 {1900), No. 2, pp. 87-98). — A study of the action of lime in the soil and as a factor in 

 plant growth. 



The ashes of olive residues and their fertilizing value A. Devarda {L' Engrais, 

 15 {1900), No. 22, pp. 516, 517). 



On the reversion of phosphates and notes on improvements in the fertil- 

 izer industry, W. Paysan {Chem. Ztg., 24 {1900), No. IS, pp. 185, ii^;).— Examina- 

 tions of superj^hosphate made from Tennessee phosphate containing 79 per cent of 

 calcium phosphate, 2.36 per cent of iron oxid, and 2.24 per cent of alumina, showed 

 that there was practically no reversion of the phosphoric acid from the time that the 

 sui:)erphosphate was prepared (September 2) to the time of the last examination 

 (January 17). 



On the question of the reversion of phosphates and remarks on recent 

 progress in the fertilizer industry, vox Grueber {Chem. Ztg., 24 {1900), No. 

 22, pp. 227, 228). — This article consists mainly of comments on the above article by 

 Paysan. 



The reversion of water-soluble phosphoric acid in superphosphates, C. 

 Elschner {Chem. Ztg., 24 {1900), No. 24, p. 252). — Remarks on the above articles 

 by Paysan and von Grueber. The author claims that sesquioxids combined with 

 phosphoric acid cause reversion in superphosphates only when present in very large 

 amounts and when the suj^erphosphate is quickly dried. A very rapid reversion 

 occurs, however, when the oxids are combined with silica. It is therefore combined 

 silica and not oxids of iron and alumina which should be guarded against in the 

 selection of phosphates for the manufacture of superphosphates. 



Observations on the reversion of superphosphates, Klippert {Chem. Ztg., 

 24 {1900), No. 25, pp. 265, ^66).— Remarks on the above articles. 



^Les Engrais, vol. 2, p. 234. 



