63 



den af Saltsyre dekomponerbare De] er af en meget for- 

 skjellig Størrelse. For uhindret at kunne betragte de egent- 

 lige Ler-Bestanddeles Forhold ligeoverfor Saltsyre, undlader 

 jeg foreløbig at tåge Hensyn til den kulsure Kalk. og har 

 derfor i den følgende Tabel bragt denne Substans tillige- 

 med Glødningstabet i Fradrag og beregnel de øvrige op- 

 løselige Bestanddele som Procenter af et kalkfrit Ler. I 

 den nederste Del at' T.iIm! opført de paa samme 



Maade fundne Værdier lur Len fcs samlede Bestanddele. 



Ved Betragtning al' denne Tabel kan det synes paa- 

 faldende, at de forskjellige Bundprøver viser en saa stor 

 Uoverensstemmelse med Hensyn til den ai' Saltsyre dekom- 

 ponerbare Del. medens d.' Tal. der udtrykker Lerets sam- 

 lede Bestanddele. tyder paa en nogenlunde ensartet Sam- 

 mensætning. Hertil maa imidlertid bemærkes. at Behand- 

 lingen med Saltsyre ikke kan give noget synderlig værdi- 

 fuldt Resultat til Sammenligning af de forskjellige Slam- 



in bydrochloric acid is seen to differ verj considerably in 



Hie for ! <>ln ::n .i! ms. Witll a \ie\V to i 11 \ e-,1 ! ate With 



greater freedom fché effect of hydrochloric acid mi the con- 

 stituents el' tin- true clay, no regard has now hem had 

 to the cai'bonate oi' lime. aud fcherefore thai substance, 

 bogether loss by ignition, has accordingly in the 



following Tahle been subtracted from the remaining decom- 

 posable parts, which are computed as pércentages oi' a clay 

 exhibiting uo trace of lime. The lower columns of the 

 Tahle show the values, found in like manner, lnr the 

 united constituents of the deposit. 



On examining this Tahle. it ma; seem strange that 

 the various samples should exhihit very considerable dis- 

 agreement as regards the propoftion decomposable in hydro- 

 chloric acid. while the figures denoting the united consti- 

 tuents indicate a comparatively homogeneous composi- 

 tion. To this objection must however he replied, that the 

 ent with hydrochloric acid cannot give a particu- 

 larly valuable result for estimating the chemical composition 



- - 

 r r. 



Fei ) 



FeO. 

 Al,! ), 

 MgO 



v I 



Sum 



2.6 

 10. o 



25-4 



3-3 



57-6 



98.9 



2-5 



9.8 



20.0 



3-5 

 63-7 



2.0 



"■3 

 19.7 



i-5 

 61.6 



1.6 

 12.9 

 24.1 



3-4 

 57-7 



i.., 1.4 



8.2 8.7 



21.5 



59-i 



99.5 96.1 99.5 101.0 



64.7 



98.8 



1-4 

 8.6 



18.9 



2-7 



68.3 



i-7 

 9.1 



23.2 

 2.8 



63.8 



1 : 



99.9 100.6 



prøvers kemiske Sammensætning. Saltsyrens opløsende Virk- 

 ning maa nemlig i hoi Grad være afhængig af den Finhed. 

 hvori Slammet b.efmder sig. og denne er. som forud nævut. 

 alunde den samme i de forskjellige Partier af Bilocu- 

 linleret. Denne Uensartethed trader tydelig frem, naar 

 man betragter de forskjellige Prover under Mikroskopet. 

 11- det Resultat man erholder ved Behandlingen med Salt- 

 syre kan nærmest tjene til at belyse det samme For- 

 hold. 1 Det viste sig saaledes, at Bundprøverne fra 

 Stat. 301, 302 og '■><<*'>. der i Særdeleshed udmærker sig 

 ved lave Tal for de opløselige Bestanddele, ogsaa indeholdt 

 flere grovere Partikler end de øvrige. Som vi strax i det 



of the different samples of deposit. The decomposing effect 

 of hydrochloric acid must theri depend tu a great ex- 

 tent on the relative fineness, of the deposit, which. asprevi- 

 ously stated. is anything hut constant in Biloculina c 

 Witli the aid of the microscope, this want of uniformity is 

 di-tinctly perceptible, and the result obtained by treating 

 with hydrochloric acid is principally of value in illustra- 

 ting the same subject. 1 The samples from Stations 301, 

 302, and 306. distinguished in particular by their small 

 proportion of decomposable constituents, were found te 

 contain a greater numher ot coarse particles than the others. 

 Moreover, these samples, as will shortly appear, are in an- 



1 Finheden har ikki I Pulviseringen af di 



■ Bundprøver, 4a -jeg altid har sørget fol ■ denne Opera- 



tion saaledes, at Lerets Partikler derved ikke kunde lide nogen For- 

 andring i sin oprindelige Størn 



1 The fineness of I ' tie- result et* tin- tritura- 



ti'm of tie- dried samples, sine'- I invariably seie. rform this 



operation in su r as to pres rvc tie- particles of c 



under in magnitude. 



