466 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
On 1°3 grammes — 
Ss Tore 
Silica, . ‘ : ; : ies SOS 
From Alumina, . ‘ tf oved aioe 
02 = ab 615 . 
Alumina, . : ‘ F 3 . 4°+891 
Hermie Oxide, “* ce ee eet ee 
Ferrous Oxide, . : : : : 4:°335 
Manganous Oxide, : : ‘ °153 
Lime, gant. : : : 5 643 — 
Magnesia, . - : 5 - ; 1-923 
Water, : 7°944 
) 100 ° 334 
Loses ‘969 per cent. of water in the bath, 
