712 EXPERIMKNT STATION HKCORD. 



is brioHy doscribed. and oxperinients are roported which hidicate "that it is 

 hotter to suiii)ly nourishinont for the crop of fish iiuliroctly by increasing the 

 veijetation in tlie ponds by means of fertilizers Hum to supply food direct by 

 ,i,n-ains and other substances." 



A new sug-gestion for the preparation of potable water, A. H. Hayes (Jour. 

 Roil. A nil a Mcil. Voijis, IJ, (J!) JO), Xo. J, pj). 7,7-77, fiys. 2).^A simitle portable 

 apparatus for the clarification of muddy water by means of a gelatinous ])re- 

 cipitate of iilnniinuni liydroxid is described, and tests of its efficiency are re- 

 ported. 



Water and sewage, E. IIaselhoff ( Wasser iind Abwdsser. Leijmc, 1900, pp. 

 I.'/O: nr. ill Wds.sir it. Abicusser, 2 (IHIO), No. 7, p. 290). — This is a concise 

 treatise, suited especially for nontechnical readers, on the source, composition, 

 selection, and examination of water for household and industrial purposes, and 

 on the source, composition, harmfulness, and disposal of sewage and waste 

 waters. Methods of examination are briefly explained and a short bibliography 

 is given. 



The purification of waste water of dairies, A. Chassevant (Indus. Lait, 

 [Paris]. ,i5 [1010), Ao. C>, pp. 8/-.<^3).— This is a paper read before the fourth 

 National Congress of the Dairy Industry at Paris in P^ebruary, 1910, and deals 

 with chemical and biological processes and irrigation as means of disposing of 

 the waste waters of dairies. Attention is called to the great importance of 

 purifj'ing such wastes before they are discharged into streams or allowed to 

 percolate into the subsoil, and reference is made to the French laws and regula- 

 tions requiring such iinrification. The author is of the opinion that broad irri- 

 gation is the best, least expensive, and most profitable method of purification, 

 althougli under certain special conditions the use of a combined chemical and 

 biological process may be preferable. 



Sewage into sugar, J. Ashton (Surveyor, 31 (1910), No. Ol/S, pp. 211, 212; 

 alls, ill Eiujiii. Neirs, 63 (1010), No. 10, pp. 207, 298). — A system of sewage irri- 

 gation adapted to the production of sugar beets is described. 



SOILS— FERTILIZEES. 



Clay, P. RoHLAND (Die Tone. Vienna and Lcipsic, 1909, pp. 127). — This booli 

 is based up(jn investigations begun by the author in 1902 to determine the cause 

 of plasticity in clay. 



These investigations have shown that in clay treated with water colloid sub- 

 stances are formed which give the clay its plastic properties. This discovery 

 explains many phenomena associated with the semipermeability and absorptive 

 power of clay which are of great importance from the standpoint of agricultural 

 chemistry and plant physiology, as well as in connection with the purification 

 of water and the manufacture of clay wares. 



The matter collected in this book has already been published to a large ex- 

 tent in jieriodical literature. The four chapters into which the booli is divided 

 deal with kaolinization, the physical-chemical properties of clay, the newly 

 discovered proi)erties of clay, and their applications to processes in cultivated 

 soil. \ 



Commercial peat: Its uses and possibilities, F. T. Gissing (London and 

 Philadelphia, 1010, pp. X + 101, plx. 16, figs. .'i3). — This book discusses various 

 industrial uses of peat, including among other things the manufacture of 

 alcohol, ammonia, and nitrates, and the utilization of peat for sewage purposes, 

 the reclamation of peat lands, machinery used in handling and preparing peat 

 for various purposes, and peat deposits in different countries. 



A bibliography of the subject is also given. 



