6 



In May. 1903, before work was commenced, a second survey was 

 made; and a third survey of the tract was made in October, 1903, after 

 the close of the season's operations. 



The following table gives the tonnage of alkali in the tract, as shown 

 by these surveys: 



Quantity of alkali in the first 4 feet of soil in the Swan tract, Salt Lake City. 



a Shows the proportion of the salts removed as compared with the salt originally present in the 

 various depths. 



The data given in the above table shows that between September, 

 1902, and the following May, 3,171 tons of salt had been removed from 

 the soil to a depth of 4 feet, and that between September, 1902, and 

 the following October, 5,430 tons had been removed, or 82 per cent of 

 the alkali originally in the first 4 feet of soil. It is also seen that a 

 greater proportion of the alkali has been washed out of the surface foot 

 than out of the lower depths, and that the movement of the salts is 

 less pronounced as the depth increases. Thus originally the fourth 

 foot carried 30 per cent of the total salt, while in October, 1903, the 

 fourth foot carried 49 per cent of the salt then remaining in the soil. 

 There has been, however, a marked decrease in the quantity of salt at 

 .all the depths, and the fourth foot has in reality lost 69 per cent of the 

 quantity of alkali originally present. 



It must be understood that these changes have taken place through 

 the movement of the salts downward by percolating water and not 

 through washing them from the surface of the land. 



The following table shows the number of acres of land in each of 

 the six grades into which the Bureau classifies alkali lands, for the 

 various depths to which determinations were made in the tract. The 

 table gives the area in each grade in September, 1902, and the area in 

 each grade in October, 1903, after one year's operations in the reclama- 

 tion work. 



