A. H. HAYES, A new Suggestion for the Preparation of Potable 



Water Page 155 



WILLIAM RALPH BALDWIN WISEMAN, The Increase in the Na- 

 tional Consumption of Water 156 



H. S. SHELTON, The Correlation of Rock and River-water Analyses 156 



XIII Geology in its Relation to Agriculture. 



F. S. MARK, Estimation of Calcium Carbonate in Soils. . . . 156 



J. A. VOELCKER, Soils rendered Unfertile by excess of Magnesia 157 



E. J. RUSSELL, Phosphorous Compounds in Soils 158 



J. M. HECTOR, Nitrogen, the Plant and the Farmer 153 



W. B. BOTTOMLEY, The fixation of Nitrogen by Free-living Soil 



Bacteria . . . 158 



H. FRIEND, Worms in a Cornish Garden 160 



Ooze and Irrigation 161 



E. J. RUSSELL, Factors which determine Fertility in Soils . . . 162 



A. D. HALL, The Conservation of the Fertility of the Soil. . . 164 



The Adaptation of the Plant to the Soil . . . . 173 



The Association of Plant and Soil 174 



Old and New Studies on Fertility . . . . . . 175 



XIV Making and Improvement of Land. 



Manuring of Black Fenland 178 



The Manuring and Improvement of Mossland in Scotland. . . 178 



J. P. GISSING, Commercial Peat: its Uses and Possibilities . . 179 

 JOHN STIRLING MAXWELL and H. M. CADWELL, Afforestation on 



Moors , 179 



XV Artificial Water-storage. Irrigation. Land-drainage. 

 Sources of Water Supply in Great Britain. 



WILLIAM COLES FINCH. Water. Its Origin and Use 180 



D. A WILLEY, Irrigation and Engineering 181 



XVI Tillage. 



W. FREAM, Elements of Agriculture. A Text-Book prepared un- 

 der the Authority of the Royal Agricultural Society of Eng- 

 land !8! 



WALTER J. MALDEN, Ploughing and Ploughs 183. 



