248 



Journal of Agricultural Research 



Vol. X. No. 



Fig. 10. — Analysis curves for materials used in evaporation experiment. 



In this connection an analysis of the laboratory soil was made by the 

 Bureau of Soils. The result of that analysis for the soil of the top 2 feet 

 is given in Table XVII. 



Table XVII. — Mechanical analysis of the top 2 feet of the Irrigation Field Laboratory 

 {Denver, Colo.) soil as made by the United States Bureau of Soils 



The laboratory soil, while not a water- washed river-bed material, 

 offered opportunity for work with a material of fine texture; and the 

 results from its use are given in connection with those from the strictly 

 river-bed sands. 



With the facilities and funds available it was not possible to make a 

 complete investigation of each individual sand from the standpoint of 



