from Washington Territory. 243 



the matter may be found between Schloesing's and Hilgard's 

 views ; the Mississippi soil of Loughridge and the Rockland 

 Ridge soil which I have analyzed represent extreme types ; be- 

 tween them numberless gradations are possible. All of the 

 iron contained in the clay exists probably in the form of oxide. 

 It was not possible to make a determination of iron protoxide 

 as the amount of organic matter present was large. 



II. Silt (sediments<^ -25 mm h. v.) ; contains a still larger per- 

 centage of bases than the clay. It was impossible to determine 

 the iron protoxide, owing to organic matters. A prominent 

 feature is the high percentage of phosphoric acid. Of the 

 coarser matters only the fraction embracing the sediments of 

 8 mm h. v.-6-± mm h. v." has been analyzed. 



III. Sediments 8 mm h. v.-6± mm h. v.; These sediments 

 are the richest in bases. The amount of alkalies and alkaline 

 earths in them approaches very nearly that of the mother-rock ; 

 the quantity of phosphoric acid, however, is only half as large as 

 that contained in the rock. The increased percentage of silicic 

 acid (57"07 per cent against 50*95 per cent in the rock) and the 

 decrease of iron protoxide (2 -80 per cent against 7*11 per cent) 

 shows that a considerable chemical change has already taken 

 place. 



Analyses by extraction with hydrochloric acid of rock, soil and 



sediments. 

 IT w I i 



.28 § > K 



3-g | . . . •* 



□ I > ~ . I 



f 1 •* < I > 8 



i A-g *~" *§ Y 



£ |§ ~* I I "S ^ 



Matters insol. 



in HC1 65-41 66*28 71*87 80-21 83-98 66-89 42-90 



SiOo sol. in 



Na 2 C0 3 __ 1-57 3-74 ll'OO 1-46 7-64 8-95 33*49 

 Matters insol. 



in Na 2 C0 3 . 63-84 62-54 6087 78-75 76*34 57-94 9*41 



P 2 5 * 0-76 0-78 0-36 044 0-18 0-42 011 



S0 3 0-05 0-03 0-08 004 0*05 not det. 0'08 



H 2 o 0-34 1-20 1-77 021 0*34 



K 2 noif not -78 . 0-32 0-38 0*61 



Na a O deter. deter. -67 0-91 0-63 0-52 



CaO___ 6-29 6-54 2-48 301 2-58 2-07 047 



MgO 3-42 3-05 -97 1-06 0*82 144 1-16 



Fe 2 3 13-85 14-50 9*22 353 456 10*83 17.90 



A1.,0 3 8*25 10*25 8*95 10-63 5*90 9*15 15*48 



Org. matter.. 3-52 _. 7-40$ 13-86J: 



100*67 100*06 99-42 99*33 



* By extraction with HN0 3 . \ KC1 + NaCl==4"54 per cent. "{"Org*, matter and water. 



Am. Jour. Sci.— Third Series, Vol. XXXYI, No. 214.— Oct., 1888. 

 16 



