1624 
than in the normal fresh water and also greater than in the normal 
salt water, so that a mixing of these two types of water cannot 
cause the larger sodium content. 
HI. That in places where the diluvium still rises above the sea 
level and where the fresh water has colleeted without expulsion of 
Na 
sea water, the proportion ec …— does not increase near 
aoe. | Nat Me+Ca 
the border of salt- and fresh water ; 
‘ ; Na ' 8 ; 
IV. that the proportion eq. —— in the water rich in 
Na+Mg-+Ca 
sodium approaches about to that in the normal salt water so that 
the assumption of a reversible chemical action being the cause is 
an obvious one; 
Na 
Na+Mg+Ca 
exception greater than in normal salt water, but that, looking at 
the fact that Mg also takes part in the reaction, the explanation 
given does not become invalidated thereby. 
The formation of water with an excess of alkalis may thus be 
explained by assuming that the sea-water has ceded alkalis to the 
soil and that those, when the sea-water was being displaced by 
calcareous fresh water, have in turn been exchanged for calcium. 
V. that certainly the proportion eq. is by way of 
LITERATURE. 
R. Gans, Zeolithe und ähnliche Verbindungen, ihre Konstitution und Bedeutung 
für Technik und Landwirtschaft. Jahrb. der Kön. Preuss. Geol. Landesanstalt für 
das Jahr 1905 Bd. XXVI p. 179. 
—— Konstitution der Zeolithe, ihre Herstellung und technische Verwendung 
idem 1906 Bd. XXVII p. 63. 
Dr. J. Lorré, Onze brakke, ijzerhoudende en alkalische bodemwateren. 
Mededeelingen omtrent de geologie van Nederland, verzameld door de commissie 
voor het Geologisch onderzoek, No. 26. 
Verhandelingen der K. A. v. W. te Amsterdam (2e sectie), Deel VI No. 8, 1899. 
Rümerer, Deutsche Zuckerindustrie 1901, bi. 585. Internationaler Kongress für 
angewandte Chemie. Berlin 1903. Bd. III bl. 59 —69. 
E. RAMANN, Bodenkunde, 1911 p. 54 and further. 
W.G. N. van DER SLEEN, Bijdrage tot de kennis der chemische samenstelling 
van het duinwater in verband met de geomineralogische gesteldheid van den 
bodem, 1912. 
