SOILS FERTILIZERS. 815 



Purification of water for residences, J. H. Dunlap {Proc. loiva Engin. Soc, 

 25 (1913), pp. 69-79, figs. S). — Data are quoted wliich indicate tlie sanitary 

 value of the purification of water for liouseliold use, and a discussion is given 

 of purification by chemicals, electricity, heat, and filtration. In connection with 

 the last 2 methods several types of household apparatus are described. 



The majority of household filters are considered valueless and from the results 

 of a number of tests it is concluded that natural stone filters are to be avoided. 

 As a final conclusion it is stated that the so-called Forbes sterilizer is a most 

 practical device for boiling water, but for water containing an objectionable 

 amount of suspended matter rapid or slow filtration with household apparatus 

 is necessary. The subsequent sterilization may be obtained by either boiling 

 or by filtration in the Pasteur or the Berkefeld filters, which consist of filtra- 

 tion tubes of unglazed porcelain and diatomaceous earth, respectively, providing 

 these filters are sterilized daUy. 



SOILS— FERTILIZERS. 



Glaciation and soils, E. Babeett (Ind. Dept. Geol. and Nat. Resources Ann. 

 Rpt., 36 {1911), pp. 11-30, pi. 1, figs. 7).— It is the main purpose of this article 

 to discuss the Ice Age in its relation to the soils of Indiana. The Labradorian 

 ice sheet in two of its stages, the Illinois and Wisconsin, is considered to have 

 profoundly iufiuenced the surface and soils of the northern three-fourths of the 

 State with its two accumulations of drift. It is stated that glacial soils are 

 generally rich in all the basic elements and that they are heterogeneous in 

 material and arrangement, containing a relatively larger proportion of silt 

 particles and less clay than soil formed by chemical processes from the same 

 rock. 



[Soil surveys in Indiana] (Ind. Dept. Geol. and Nat. Resources Ann. Rpt., 36 

 (1911), pp. 33-468, pis. 17, figs. 25).— In a series of eight articles soil surveys 

 by methods similar to those of the Bureau of Soils of this Department are 

 reported of Hancock, Johnson, and Shelby counties, by A. D. Hole (pp. 33-82) ; 

 Morgan and Owen counties, by J. B. Edmondson (pp. 83-134) ; Clay, Knox, 

 Sullivan, and Vigo counties, by C. W. Shannon (pp. 135-280) ; La Porte, St. 

 Joseph, and Bartholomew counties, by E. J. Quinn (pp. 281-334) ; Spencer, 

 Warwick, and Scott counties, by A. W. Mangum and N. P. Neill (pp. 335-381) ; 

 Posey County, by H. W. Marean (pp. 382-407) ; Greene County, by W. E. 

 Tharp and C. J. Mann (pp. 408-446) ; and Marion Coimty, W. J. Geib and 

 F. C. Schroeder (pp. 447-468). 



Deli soils, J. G. C. Vkiens (Meded. Deli Proefstat. Medan, 5 (1911), No. 9, pp. 

 S27-3S5; 6 (1912), No. 8, pp. 293-296; 7 (1912), Nos. 5, pp. 171-173; 6, pp. 297- 

 308). — Tliis is a continuation of the report on analyses of tobacco soils previ- 

 ously noted (E. S. R., 25, p. 321). 



Studies on acid soils of Porto Rico, O. Loew (Porto Rico Sta. Bui. 13, pp. 23, 

 Jig. 1). — ^At the outset the author distinguishes between "soil acidity due to 

 humic acids and that due to mineral compounds " as typically represented in 

 Porto Rico by acid red clay soils. " The acid soils of Porto Rico owe their 

 acidity not to humic acid but to an acid clay." This acid clay is designated 

 argUlac acid, and the author proposes for it the following structural formula : 



HO- ^i C 0-— ^AI OH 



(a) >0 (b) 



HO Si^=- — O /Al -OH 



