GRAPHIC REPRESENTATION OF THE MINERAL CONTENT OF THE ROCKS 
ACID. INTERMEDIATE. OAaio. 
In this diasiani the length of the intercept of any mineral on the vertical line will give the percentage of that mineral in a given rock section. 
Twelve sections" were measured, numbers 1 to 6 and 9 to 12 being from the Oatland complex, and numbers 7 and 8 from the Ballabunt Rock. 
In each case also the order in which the minerals are placed, reading from top to !)ottom. will give the order in which they successively crystaUised 
in bulk. proc. Yorks. Geol. Soc, Vol. XVII., Plale XI. 
