296 THE PRACTICAL PLANTER. 



a manner as that their lower edges may join 

 just flush with the face of the wall on either 

 side : the one being lapped over the other, so 

 as to cover the joint, and form a thin, sharp 

 edge at top ; being well packed underneath, 

 and joined close to each other lengthwise. 



Next to the above, in cases where they 

 can be procured, I would recommend a 

 coping of calcined cinders (danders) such 

 as are produced at glass-works, salt-works, 

 iron founderies, &c. If formed in manner 

 as above, and properly dashed with lime, it 

 may be questioned whether they do not 

 make the best cope of any. They adhere 

 very closely ; from their porous nature, they 

 imbibe the new laid on mortar, which, in this 

 particular case, should be used thin ; and, 

 from their varied and beautiful tints, espe- 

 cially those found at glass-works, the coping 

 looks very gay. Being a calcination, their 

 durability cannot be questioned. 



I next advise, in common cases, and 

 where neither of the above materials can be 

 procured, a coping formed of large, some- 

 what irregular blocks, such as will reach 

 across the wall from side to side ; whose 





