Note 35 — Chapter VII · THE DENSITY AND VOLUME-WEIGHT OF SOILS.
Reading edition
Schübler (Grundsätzed. Agrikulturchemie, 1838) ascribes the crumbling of calcareous clay soils to the difference in the contraction of calcareous sand and the clay substance. But it is doubtless more directly connected with the flocculation of the latter by lime.