Stone and Brick Walls

The outter stone walls of the Cathedral are made of stone and are lined with bricks.  We have seen this in  many places.  This is apparently a common feature of stone walls.

Even in the heart of stone-districts bricks are now generally used for all internal walls, and for all but the facing of external walls. Their cheapness, and the facility with which they can be laid, have led to their adoption .....
.......external walls ......consist of an outer skin of stone ..... and an inner lining of .....brick,  ...These walls have usually one stone through in every square yard, ....

Stone wall with through stone (A)

Sometimes, however, cast or wrought iron ties are used instead of through-stones...

Stone wall with brick lining bonded by wrought iron ties

West Gable Wall showing wrought iron tie

For larger buildings, ...thicker walls should be used. This gives an opportunity for substituting bond-stones as at A (See Figure below) for the through-stones previously mentioned, and the brick lining may be tied to the body of the wall either by inner bond-stones as B, or preferably by rows of headers every fourth or fifth course as at CC.¹
 

Brick lined stone wall with outter bond stones (A), inner bond stones (B) and brick headers (C,C)

North Gable Wall with bond stone showing around the window arch

¹G. Lister Sutcliffe, The Principles And Practice Of Modern House-Construction (Blackie & Son Ltd, 1900)