Walls 35 



higher than they are wide. See that the 

 stones are carefully fitted to their posi- 

 tion. 



A wall set in cement mortar is naturally 

 more permanent. Each stone is then held 

 firmly to its neighbor and the whole be- 

 comes almost a monolith. Especially is 

 this true when all crevices are well filled up 

 with the mortar. There are several ways 

 in which a wall of this kind may be laid up. 

 The joints between the stones are often 

 filled with the mortar flush to the outer 

 surfaces of the stones. By this method 

 truer and more even faces are secured. 

 Sometimes the joints are raked out. 

 That is the mortar does not come out to 

 the surface but stops anywhere from one 

 half to two inches back. If it is carried 

 in deep enough the effect of a dry wall is 

 the result. In a very thick wall, say three 

 feet or over, mortar is only necessary in 

 the center and this also has the appearance 

 of a dry wall. The method of laying is 

 determined largely upon the nature of the 

 stones and kind of surface wished for. If 

 the stones have rounding faces, it is a sav- 

 ing in mortar not to make a flush finish for 



