4 BULLETIN 551, TJ. S. DEPAETMEKT OF AGRICULTURE. 



35. Susquehanna fine sandy loam. Eight miles northeast of Shubuta, Miss. Depth 

 to 10 inches. The description of Xo. 33 applies to this sample. Both soil and sub- 

 soil are typical. 



36. Susquehanna fine sandy loam. Subsoil of Xo. 35. Depth 10 to 36 inches. 



37. Susquehanna fine sandy loam. Four miles south of Hartsfield, Ga. Depth 

 to 12 inches. The description of Xo. 33 also applies to this sample. The subsoil 

 does not seem to be as highly plastic as the average of the type; otherwise the sample 

 is typical. 



38. Susquehanna fine sandy loam. Subsoil of Xo. 37. Depth 12 to 36 inches. 



39. Portsmouth fine sandy loam. Two miles south of Murphy, Ga. Depth to 12 

 inches. This is a black to rusty -brown, mucky, fine sandy loam, compact and heavy 

 when wet. Large quantities of organic matter in all stages of decomposition are 

 present. The type is formed from the worked-over material of the higher-lying 

 provinces. "When drainage conditions are favorable, the fertility is fair. The soil 

 and subsoil are typical. 



40. Portsmouth fine sandy loam. Subsoil of Xo. 39. Depth 12 to 36 inches. 



41. Susquehanna clay. Three miles east of Shubuta, Miss. Depth to 4 inches. 

 The soil of this type is a clay loam, sometimes containing gravel, and the subsoil a 

 stiff, tenacious, red and mottled clay. It is formed from unconsolidated deposits of 

 the Coastal Plain. The soil is very refractory and hard to cultivate and at present 

 has very little agricultural value. The sample, both soil and subsoil, are typical. 



42. Susquehanna clay. Subsoil of Xo. 41. Depth 4 to 36 inches. 



43. Coxville fine sandy loam. Florence, S. C. Depth to 8 inches. The soil of 

 this type consists of a gray to dark-gray moderately heavy fine sandy loam overlying 

 a stiff, rather plastic clay, which ranges in color from yellow in the upper part to 

 mottled yellow, drab, and bright red in the lower section. Small iron concretions 

 and quartz gravel are sometimes encountered in both soil and subsoil. In productivity 

 it is only fair. This soil is derived from unconsolidated deposits of the Coastal 

 Plain province. 



44. Coxville fine sandy loam. Subsoil of Xo. 43. Depth 8 to 16 inches. 



45. Coxville fine sandy loam. Lower subsoil of Xo. 43. Depth 16 to 36 inches. 



PREPARATION OF SAMPLES AND METHODS OF ANALYSIS. 



The preparation of the samples for analysis was essentially that 

 described in the previous report x and the methods of analysis were 

 those used in the analysis of silicate rocks followed in the previous 

 work, and described in detail by Hildebrand. 2 



In carrying on this work the authors gave considerable attention 

 to the limits of error in the more important determinations involved 

 in soil analysis, and lest too much significance be attached to small 

 differences they feel warranted in making the following statement. 

 When working on the same sample of a soil of average composition 

 the determinations of two analysts who have had experience with 

 the methods used should not differ more than 0.50 per cent in the 

 case of Si0 2 , 0.05 in the case of TiO,, 0.20 A1 2 3 , 0.15 Fe 2 3 , 0.003 

 MnO, 0.10 CaO, 0.15 MgO, 0.05 K 2 0, 0.05 Na 2 0, and 0.04 P 2 5 , 

 these figures being percentage of soil, not percentage variation. 

 Duplicates by the same analyst should of course agree more closely. 

 Variations in the solubility of glassware were found to be a most fre- 

 quent source of disagreement in CaO and MgO determination. 



i U. S. Dept. Agr. Bui. No. 122 (1914). - U. S. Geol. Survey Bui. 422 (1910). 



