SOILS FERTILIZERS. 25 



beyond 1906. The review is, liowever, the most complete that has recently 

 ap pea red. 



The value of potash silicate, ground phonolith. ('. Brommk (Dnit. Laiifhr. 

 Prcsse, 36 (1909), No. 9, pp. 90, 91). — It is stated in this article that the avail- 

 ability of potash silicate may be greatly increased by mixing it with manure 

 in the stall, and that its efficiency is greatly increased by letting it lie in the 

 held over winter. 



Influence, of phosphatic fertilizer on the phosphoric acid and nitrogen of 

 the seed of corn, A. Parrozzani (Ann. R. t<taz. Chim. Agi: tiper. Roma, 2. ser., 

 2 {1907S). pp. 373-3<S2; .S/flC. Sprr. Agr. ItaL. J,l (1908), No. 9-tl, pp. 729- 

 73S). — The application to corn of nicreased amounts of mineral superphosphate 

 resulted in a correspondingly increased percentage of total phosphoric acid in 

 the seed. While the phosphoric acid of the lecithin and of the oxymethylphos- 

 phoric acid of the seed increased, that of the nucleiu remained constant. 



The increase in phosi)liiitic fertilizer did not cause any sensible variation in 

 total nitrogen content. The proteid nitrogen underwent a slight increase and the 

 iiouproteid nitrogen a corresponding decrease. Of the proteid nitrogen, zein 

 inci'eased quite sensibly and the other proteid substances diminished. 



The general conclusion is drawn that phosphatic fertilizing exercises a con- 

 siderable influence on chlorophyl assimilation. 



The analytical methods used are described. 



Raw phosphates and green manure, S. de Grazia (Ann. R. Staz. Chim. Agr. 

 t^per. Roma, 2. ser., 2 (1907-8), pp. 25-31). — This is a continuation of a report 

 previously noted (E. S. R., 19, p. 719). 



Fertilizing with raw phosi)hates proved as valuable to plants for green ma- 

 nure as slag, but superphosphate gave better results. Beans were benefited 

 less than vetch. Application of the fertilizers (super])liosphate included) 

 at the time of turning under of the green crop gave less favorable results than 

 when applied in two applications, at the time of sowing and at the time of turn- 

 ing under, and the highest returns were obtained when all the fertilizer was 

 applied at the time of sowing. 



The phosphate land question (Engin. and Min. .Jour., 87 (1909), No. 10, 

 pp. ')0.'). 506). — This is a discussion based uix)n a statement by F. B. Weeks, 

 formerly of the Geological Survey, and on a report of the committee of Congress 

 on public lands explaining a proposed location law applying to western phos- 

 phate lands withdrawn from public entry by executive order (E. S. R.. 20, pp. 

 099, 925). It is estimated in the report referred to that the available phos- 

 phate in the reserved area amounts to 1,400,000,000 tons, enough to last over 600 

 years at the pi'esent rate of consumption. 



Mining and milling Florida phosphates, C. A. Stone (Engin. and Min. 

 Jour., 87 (1909), No. 10, pp. -',90-.'i92, figs. 11; abs. in Chem. Ahs., 3 (I909>), No. 

 10, p. 1198). — A brief account is here given of the machinery and methods em- 

 ployed in this hidustry. 



Lime and liming, L. L. Van Si.yke (A'cjo York Stair ^7«, Circ. 10, pp. 12). — 

 This is a circular of information regarding the use of lime compounds on soils, 

 composition of lime compounds, best forms of lime to use, ground phosphate 

 rock or floats, and slag phosphate. 



Action of calcium fluorid in leucitic soils, G. Ampola (Ann. R. Staz. Chim. 

 Agr. Spcr. Roma. 2. ser.. 2 il!)07-8), pp. 20-22).— The effect of lencite. lime, 

 calcium fluorid, and sulphate of potash was tested singly and in combination on 

 lupines and vetch and on potatoes following them. . Lupines and vetch were 

 used as green manure. The results showed that the addition of the fluorid 

 caused an increase of product both in the case of the green manures and of the 



