236 E.A.Schneider — Analysis of a Soil 



borough Bays. The upper end of old Tampa Bay is now in 

 process of occlusion, and with a little more elevation will be a 

 lake. 



In the section exhibited by the figure at the head of this 

 article (p. 231), — one or two later beds, — all of conjectural 

 thickness — are represented as overlying the Waldo formation, at 

 least in part. The borings for water at Palatka, at St. Augustine, 

 at Jacksonville, give much certainty of a rapid dip toward 

 the Atlantic, and of an increasing depth of the Neocene beds 

 as we advance northward. The mouth of the St. John's or of 

 the St. Mary's River will come in about the bottom of the 

 ancient Miocene bight of the Atlantic which occupied so large 

 a part of southern Georgia. Much further investigation and 

 patient scrutiny will be required to ascertain the details of the 

 depth and extent of these later formations, and to assign to 

 each its proper horizon. 



Akt. XXI V. — An Analysis of a Soil from Washington 

 Territory, and som,e remarks on the utility of Soil-analysis; 

 by Edward A. Schneider. 



The soil and rock, the analyses of which are given on the 

 following pages, were kindly furnished to me by Professor 

 E. W. Hilgard from his extensive collection of soil specimens, 

 for which favor I offer him on this occasion once more my 

 thanks. 



The place of occurrence of these specimens is the Rockland 

 Ridge, near " The Dalles," on the Columbia River, Washing- 

 ton Territory. The geological indications, as I have been told, 

 were that the soil was formed "in situ" by disintegration of 

 the rock. Comparative analyses have confirmed this supposi- 

 tion ; still it is probable that the soil contains a small amount 

 of constituents which do not form a part of the mother-rock ; 

 particularly noticeable among this class is mica. I am indebted 

 to the kindness of Professor A. W. Jackson, of the University 

 of California, for the petrographic analysis "of the thin sec- 

 tions which I had prepared. According to the statement of 

 Professor Jackson, the constituents of the Rockland Ridge 

 rock are: " plagioclase, augite, apatite, magnetite, undifferen- 

 tiated glass ;" the rock is consequently, according to the same 

 authority, an augite andesite. 



The analyses of the mother-rock and of the soil disclosed 

 the following results : 



