(15) 
But, from a hundred grains of a brown, iron-coloured 
Limestone, selected from the Dock-Yard, the hollows 
of which were filled with small rhomboidal crystali- 
zations, the proportion of Magnesia was consider- 
ble, being nearly twenty-one or twenty-two parts in 
a hundred:—and, lastly, from the red, calcareous 
stone, from the western end of Mount Wise, the 
quantity of this substance, although not so much as 
in the last-mentioned specimen, was, nevertheless, 
about eight parts in a hundred. 
