42 



Samlede Bestanddele : 



FeO 1 Pe s 3 ALI), CaO MgO CaC0 3 



2.98 3.78 17.58 0.28 1.24 4.02 

 Glødn.tab Sum 



4.13 100.72 



P 2 5 Si0 2 

 Spor 66.71 



Station 213. 



N. B. 70" 23', . 0. L. 2" 30'. 1760 Favne (3219 

 Meter). — 1.2°. Graat. yderst fint Ler. liggende under 

 Biloculinleret. livoraf der paa denne Station kun fandtes 

 ganske smaa Mængder. 



Lerets speeitiske Vægt var 2.79. 



Glødningstab .. . 5.59 



Jernoxydul . . . 3.06 



Jernoxyd .... 4.45 



Lerjord' .... 6.32 



I Kalk l.2t) 



Magnesia . . . . 2.76 



Kulsur Kalk .. . 4.27 



Fosforsyre . . . Spor 



Kiselsyre .... 14.00 



Jernoxyd-. . . . 2.72 



Lerjord . . . .11.77 



Magnesia . . . . ! .59 



Kiselsyre . . . .4142 



Constituents of Sample: — 



Dekomponeret 



af 



Saltsyre 



36.06 pCt. 



I rdekomponeret 



af 



Saltsyre 



rj7.20 pCt. 



Sum 98.85 



Samlede Bestanddele : 

 FeO Fe 2 3 A1 2 3 CaO MgO CaC0 2 P 2 5 Si0 2 

 3.06 7.17 18.09' 1.20 4.35 4.27 Spor 55.12 



Glødn.tab Sum 



. 5.59 98.85 • 



I den følgende Tabel bar jeg opstillet de Kalkbestem- 

 melser, der ved Hjælp af Jobnsons Apparat er udførte i 

 Prover fra det graa Ler, tilligemed Mængderne af Jern- 

 oxydul og Jernoxyd, som samtidig er fundne ved Titrering 

 i det saltsure Udtræk. I de sidste Rubriker har jeg opført 

 den samlede Jernmængde og Forholdet mellem Oxyderne, 

 hvilket altsaa er et Udtryk for Lerets Oxydationsgrad. 

 For Tabellen er ogsaa medtaget Undersøgelserne af. det 

 graa Ler fra nogle af de Stationer, hvor det forekommer 

 som et underliggende Lag indenfor de andre Sedimenters 

 Omraade. Oplysning derom er tilføiet under Anmærk- 

 ninger. 



1 Jemoxydulniirngdoii refererer sig her — ligesbm i de følgende 

 analyser — biol til dén of Saltsyre dekomponerede Bel. da den ikke 

 er bestemt i den uopløselige. 



Foruden de ovenanførte Bestanddele fandtes i alle Bundprø- 

 veme Spor af Mangan i Residuet fra det saltsure Udtra>k ; dette indr 

 holdt ogsaa i Admindelighed smaa Mængder af Kalk. 



FeO. 1 



2.98 



Fe 2 3 

 3.78 



A1 2 3 CaO MgO 

 17.58 , 0.28 1.24 

 Loss by Ignition. 



4.13 = 100.72 



CaC0 3 ■ P 2 5 Si0 2 

 4.02 Traces 66.71 



Station 213. 



Lat. 70° 23' X., long. 2° 30' E.: 1760 fathoms (3219 

 metres); bottom-temperature - 1.2". A grey, exceedingly 

 fine clay underlying the Biloculina- clay that occurred very 

 sparingly at this Statiqn. 



Specific Gravity of Sample 2.79. 



Loss by ignition . 5.59 

 Protoxide of iroh . 3.06 

 Sesquioxide of iron 4.45 

 Alumina .... 6.32 



Lime 1.20 



Magnesia . ' . . . 2.76 

 Carbonate of lime . 4.27 . 

 Phosphoric acid Traces 



Deoomposed 



by 



Hydrochloric acid 



36.06 per cent. 



Silica 



14.00 



98.85 



. Constituents of Sample : — 

 FeO Fe 2 3 ALA CaO 'MgO CaCO»' PA Si0 2 

 3.06' 7.17 18.09 1.20 4.35 4.27 Traces 55.12 

 Loss by Ignition. 



5.59 



= 98.85. 



In the following Table I have given the amount of 

 lime determined with Johnson's apparatus in samples of 

 the grey clay. together with the proportion of protoxide 

 and sequioxide of iron found by titration in the hydrochlo- 

 ric acid solution. The four right hand columns show the 

 total amount of iron and relative proportion of each oxiilc. 

 thus expressing the degree of oxidation in which the clay 

 occurs. The results set forth in the Table also comprise 

 thosé obtained on analysing grev clay from some of the 

 localities ' where it constitutes an under laver of other 

 oceanic. deposits. Such samples' are specified in the last 

 column, headed "Remarks." 



1 The protoxide of iron refers exclusively, bpth here aud in all 

 sulisequent analyses, to the amount decomposed by hydrochloric acid; 

 in that remaining insolublé it was not determined. 



Exclusive of the constituents specified above, all the samples 

 of the bottom cxliit >it <■■ I traces of manganése in the residue from the 

 hydrochloric acid decoction, whicli al o eontained as a rule small quan- 

 tities of lime. 



