6. YORKSHIRE. 1 2j 



We have feen the ull-lefsnefs of unburft 

 lumps of lime in cement ; and the good ef* 

 fedt of puddling cement has been at lead 

 conjectured. 



Compa5lnejs feems to be efiential to the 

 hardnefs of cement. When mortar is laid 

 in with the trcjuel, it remains in the ftate in 

 which it is hid, and does not run together 

 into a cloie form, like melted metal or 



LIQUID CI>MENT. 



Much care, therefore, is requifite in the 

 preparationof mortar for the trowel. Work- 

 ing it with the fpade alone is infufficient. 

 Beating it with the edge of a board, a kind 

 of wooden axe, is more efficacious, but is 

 very tedious. Mills for the grinding of clay- 

 are common, and fufficiently effedual of the 

 purpofe intended : but a mill for the grind- 

 ing of mortar I have not yet either feen or 

 heard of ! 



6. Oak. This is now almofl wholly laid 

 afide as a material of the houfe-carpenter ; 

 except for door and window- lintels, wall- 

 plates, and Ibmc few other purnofes, which 

 require ftrength and durability. The ports 

 pf Whitby and Scarborough take off the 



larger 



