from Washington Territory. 



237 



Analyses of the mother -roch and of the soil. 





lble in HC1. 

 iNa 2 C0 3 _. 

 in Na 2 C0 3 . 



By fusion. 



By extraction with HC1. 



Matters insoli 

 Si0 2 soluble ii 

 Matters insol. 

 Total Si0 2 ... 



p 2 o 5 t 



Rock. 



50-85 

 0-76 

 0-05 

 0-34 

 1-13 

 2-37 

 9'33 

 5-57 

 711 

 10-03 

 12-54 



100-08 



Soil. 



58-16 

 0-43 

 0-07 

 1-77 

 1-68 

 2-56 

 4-57 

 1-99 



10-59 



15-03 



3-52 



100-37 



Rock. Soil, 

 finely triturated. 



75-41 71-42 



1-57 7-73 



63-84 63-69 



0-76 0-43 

 0-05 0-07 

 0-34 1-77 

 notj: 0-78 

 determined 1'02 

 6-29 3-02 

 3 42 not 



determine 



13-85 9-22 

 8-25 935 

 352 



Soil, 

 untriturated. 



71-87 



11-00* 



60-87 



0-36 



S0 3 



H 2 0__ 







0-08 



1-77 



K 2 







0-78 



Na 2 







0-67 



CaO 



MgO 



PeO 



Fe 2 3 







2-48 



•97 



>d .... 



9-22 



Al 2 Og 







8-95 



Org. matter .. 







3-52 

 100-67 • 



Since a soil is a very complex mixture. I proceeded first of 

 all to separate it as far as possible into its mechanical elements. 

 For this purpose I passed the reddish brown soil consecutively 

 through three different sieves. I obtained thus rock fragments 

 >2 mm n, fragments <2 mm n >*6 mm n , and a quantity of fine 

 earth < *6 mm □ , which formed the bulk of the soil-specimen. 



196937 grm of the fine earth dried at 100° were treated 

 according to the directions of Professor Hilgard for the me- 

 chanical analysis of soils. § I thus obtained 



2'8500£ r 

 3-4232 

 •7125 



•7987 



1-9012 

 2*2637 



2-7200 

 1-6850 

 1-5242 

 1-1617 



•6382 



19-6784 



clay 14*46 per cent. 



sediment <-25 mra h.v.|| 



" -25 " 



•5 

 1 



2 



4 



8 



16 



32 



64 



17-38 



u 



3-62 



a 



4-05 



a 



9-65 



a 



11-49 



a 



13-81 



a 



8-55 



a 



7-74 



u 



5-88 



<i 



3-24 



a 



99-87 



* It is possible that soda- solution dissolves more silica from the untriturated 

 than from the triturated soil, because, during the process of boiling, it gets better 

 access to each particle of the soil. 



t By extraction with HN0 3 . 



X Alkaline chlorides — 4-54 per cent (alkaline chlorides obtained by fusion 

 = 6-25 per cent. 



§ This Journal, vol. vi, Oct., 1873. 



|| h. v. = hydraulic value. 



