244 E. A. Schneider — Analysis of a Soil 



Discussion of the analyses of the sediments by extraction with 

 hot hydrochloric acid. 



These analyses have first of all revealed the fact that the 

 amounts of alkalies and alkaline earths, which were obtained 

 by extraction with hydrochloric acid from the sediments 8 mm 

 h. v .-64 mm h. v., -25^ m h. v.-8 mm h. v., <-25 mm h. v., and from 

 the clay decrease almost proportionately to the decrease of total 

 percentages obtained in the analyses by fusion. 



The total amount of alkali-chlorides for instance in sediments 

 gmm Yl. v.-64 mm h. v. yielded by the method of J. Lawrence 

 Smith, is equal to 7"88 per cent. By extraction with hydro- 

 chloric acid 2'50 per cent were found. The total amount of 

 alkali-chlorides in the silt obtained by the J. Lawrence Smith 

 method is equal to 5*94 per cent. If we write now the propor- 

 tion : 



7*88 : 2-50=5-94 : x 



we find x =1*8 8 per cent, while 1*95 per cent of alkali-chloride 

 were found in the silt by extraction with hydrochloric acid. 

 The following tables exhibit these facts. 



Sodium and potassium chlorides found. 





By 



J. Lawrence Smith 





h. v. 





Method. 



By extraction with HC1. 



Qmm_g^mm h 



'88? 



, j K 2 =l-53# 



"" \ Na 2 O=:2-90 



2 . 22 *_ JK 2 =-32# 

 lll/0 - (Na 2 = -91 



•25 mm -8 mm 







r79 _|K 2 =-38 

 "- 1 ' y -]is T a 2 = -63 



<^-25 mm 5 



94 



j K 2 =1-76 

 ~~ { Na 9 = l-67 



■._ _ jK 2 =-61 

 19 ° -UXO=-52 







EO =1-08 



„ feA KO =-78 



Soil 7*48 



J 2 



~~ ( Na 2 = 2-56 



2 '°° =JNa 2 = -67 



Calcium 



/ oxide and magnesium oxide found. 







By fusion. 



By extraction with HC1. 



h. v. 





Per cent. 



Per cent. 







CaO. MgO. 



CaO. MgO. 



omm_g^mni 





. 6-55 2*59 



3-01 



.nsmmomm 





2-58 -82 



<^-25 mm __ 





. 3-07 1-72 

 . 4-57 1-99 



2-07 1-44 



Soil 





2-48 -97 





. 



Phosphoric acid found. 







Total 



•By extraction with HN0 3 . 



h. v. 





Per cent. 



Per cent. 



omm_gA mm 





-33 



•14 



•25 mra -8 mm 





-24 



•18 



</25 mm _. 





-42 



•42 



Soil 





-43 



•36 



