MICROSCOPICAL CHARACTERS OF THE WHIN SILL. 
Table illustrating the Composition of a Specimen of the Whin Sill from Cauldron Snout, Durham. 
SHO AOL |AUECO) 
MU CTE OR. Or ahase coc teaas OZ cans 
Titaniferous ore ......| ...... DAD ines 
Potash felspar «..:.... ATO Ne sivas 
Soda felspar Ge .ccacses. <2 MAR) aeches 
Time felspar’, wie. .02-.. BARB cassis 
Ps UE) JMS UnR Are Comicurel ec Re cael tmmenc | iertree 
LEAR COLL SA UMA Obed cpnetae (ie Cenacall anenon 
erg ail ote tes eee eee 2 Be cere 
Motel) feeine andusar ics 51:22} 2°42 | 14:06] 4:32 
which represents quantitatively both the chemical and mineralogical 
composition of the rock :— 
FeO. | MnO. MgO,| K,O. | Na,O.| H,O. 
CO,. | P,O,. | FeS,. | Total. 
a | | | | 
016 | 8:33 
O19 | 0:25 | 0-49 | 9967 
