6. YORKSHIRE. 133 



let into the walls at the ends; fo that not- 

 withftandingthe granaries may be furroundcd 

 with vermin, they are proof againft them. 



In the floor is a trap-door with taclile over 

 it, to raife and lower the corn from and to 

 the barn-floor. 



The height between the floors thirteen 

 feet. This in my opinion is too great a 

 height. Ten feet high is the moft the flail 

 requires * ; and every inch above that height 

 renders the granary in many refpedts lefs 

 commodious. 



Confining the dufl:, which always rifes 

 more or lefs in thrafliing, appears to be the 

 only objedtion to a barn-floor-granary : 

 1 mean in a barn with pitch ing-holes tohoufe 

 the corn at. But if ventilators were made 

 immediately under the granary-floor, with 

 valves to open or fliut as the wind fliould 

 change, the health of the thraflier would in 

 all probability be lefs injured than it generally 

 is by this laborious and unhealthful employ* 

 ment. 



Indeed, in this country, where tall, wide 

 folding BARN-DOORS are grown into difufe, 



* See NoRr, EcoN. Vol.11, p. 67. 



K ^ vent- 



