SOILS FERTILIZERS. 521 



those have been available. . . . The l>uilt'tiu is divided into two parts. i)art 

 one containing: the bibliojj:rai)hy, and part two containing a list of nmps relating 

 to North Carolina." 



A detailed and carefully prepared index makes it easy to find what has been 

 pnblished on the various subjects covered by the bibliography. A considerable 

 •number of references will be found in this index on such subjects of special 

 agricultural interest as drainage, meteorology, and climatology, soils, limestone, 

 marl, and phosphates. 



Soils of New South Wales, I, H. I. Jensen (Agr. Gaz. N. 8. Walct, 21 {1910), 

 No. 2, pp. 95-llJf, map 1). — This article deals with the soils of the South Coast 

 and discusses the judging of the agricultural value of land by natural forest 

 growth, underlying rock formation, and chemical analysis combined with field 

 observations. The last method is considered most reliable. The author con- 

 siders the thickness and size of forests no guide to the agricultural value of 

 land, but thinks forest growth has a decided influence on rainfall and floods. 



The chemical composition and general character of type soils of the region 

 are given. These include alluvial, sandstone, granite, diorite, basalt, phyllite, 

 schist, and slate soils. The alluvial soils are well supplied with plant food, 

 the sandstone soils are very poor, the soils from acid granites are poor, and 

 those from basic granites good, the diorite and basalt soils are good, and the 

 soils derived from the metamorphic rocks, phyllite, schist, and slate are usually 

 po(n'. 



The alluvial soils of Gua, G. E, Marchetti (Gior. Geol. Prat., 8 (1910), Xo. 3, 

 pp. 10o-113). — The results of ])hysical and chemical analyses of 12 samples of 

 soils from this region are reported and the data are discussed with reference to 

 the origin of the soil. 



The sand dunes of the Libyan Desert, H. J. L. Beadnell (Geogr. Jour., 35 

 (1910), No. .'i. pp. ■319-395, pis. -'/, figs. 3). — This article gives "a preliminary 

 account of the geographical and economical aspects of the great sand accumula- 

 tions of the Libyan Desert, especially in relation to the geological and meteoro- 

 logical conditions which exist in this region." It discus.ses the character, extent, 

 and methods of formation and movement of these dunes. 



The meaning and value of the chemical analysis of soils, R. D. Watt 

 {Transvaal Dcpt. Agr., Farmers' Bui. 16, pp. 7). — This bulletin gives the aver- 

 age composition of 100 typical Transvaal soils and explains the significance of 

 results obtained by chemical analysis. 



Composition of grass land, including a study of soil variations, AV. Freak 

 and J. AV. White ( Peitnsi/lrania Sta. Rpt. J909. pp. 215-2.'i3). — This is an ac- 

 count of chemical studies of soil from plats which have been used for a number 

 of years in a series of fertilizer experiments. For comparative purposes, studies, 

 were begun with samples of soil from roadways adjoining the plats. Full dis- 

 cussion of the results is reserved until further investigations have been made, 

 but the general conclusion is drawn " that close computations of the income and 

 outgo of plant food, as determined by soil analysis, as well as by that of ferti- 

 lizer, rainfall, crop, and drainage waters, requires nuich more detailed studies 

 of local variations in soil composition than investigators have heretofore been 

 making. 



"From this series of comparisons upon the soils of the parallel grass roads, 

 no general relation appears between the position of the resiiective roadways upon 

 the hillside and their chemical composition." 



The phenomena of flocculation and deflocculation, E. E. Free (Jour. Fnink- 

 lin Inst., 169 (1910). No. 6, pp. ^21~.',SH, figs. 5; 170 (1910). No. /, pp. -',6-57, 

 figs. 2).— This article summarizes present knowledge of flocculation phenomena 



