120 FARM BUILDINGS. 6, 



in this matter, it confifted in their haftening 

 the lime from the kiln to the building. 



But, in practice, it is obferved that frelh- 

 made mortar does not fet To well j does not 

 cohere into a foft-ltone-likc lubflance To rea- 

 dily as that which his been prepared fome 

 time before it be ufed. 



This fa(fl, perhaps, is acccunted for in the 

 lime having had, iinder this circumftance, 

 time to lay hold of the particles ^i fand with 

 which it is intermixed. 



But, on the fame principle, it feem: to fol- 

 low, that if the preparation be made :oo long 

 before the murur be laid into the wall, it 

 will have regained too much of its fixed air, 

 to lay hold, fufficlently, of the /tones, or other 

 tnaterials, which it is intended to bind toge- 

 ther. 



Be this as it may, it is commpn, in prac- 

 tice, when mortar is not ufcd prefently after 

 making, to cover it up clqfely from the out-i 

 ward air. It is the opinion of a perfon, who 

 laas paid this fubjc<5t confiderable attention, 

 that if mortar be buried within the furface 

 of the ground, it may be kept twelve month* 

 in perfcftion. 



The 



