8 DEPARTMENT OF AGRICULTURE BULS. 426-450. 



DEPAKTilENT BULLETIN No. 447. — ^WaTER PENETEATION IN THE GUMBO Page. 



Soils of the Belle Fourche Reclamation Project. 

 Description of tlie gumbo soil of tlie Belle Fourche reclamation 



project i ,; : 2 



Water capacity of the gumbo soil l 3 



Productivity of the gumbo soil 3 



Changes in the volume of the soil due to wetting and drying 3 



Rate of movement of water in loose, saturated soil 4 



Rate of movement of water in wet soil under field conditions 5 



Penetration of water into dry soil in the field 6 



Summary ^_ 11 



Department Bulletin No. 448. — Separation and Identification of 



Food-coloring Substances. 



General statements concerning reagents used in color analysis — 2 



Preliminary treatment of food products 4 



Separation and purification of coloring substances 8 



Identification of coloring substances 35 



Department Bulletin No. 449. — A Study of the Electrolytic Method 

 OF Silver Cleaning. 



Preliminary tests 3 



Principle of the electrolytic method 4 



Experimental study of the method J^::. 5 



A household method 11 



Summary 11 



Department Bulletin No. 450. — Improvement of Ghirka Spring 

 Wheat in Yield and Quality. 



History and description of Ghirka spring wheat 2 



Experiments 3 



Comparative yields 3 



Summary of yields 8 



Milling and baking quality 9 



Improvement by selection 12 



Conclusions 18 



