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ftove. The condu6lor is to be walled in very clofe 
on all fides with bricks, and well cemented with 
mortar made oi^ quick lime. That which the Chinefe 
iile is made with one part of white lime to two 
of black. The black lime, of which we fend a 
fample, is found at the entrance of tlie coal pits, and 
feems to us to be no other than coals dihblved bv 
rain waters. We can attelf that this fubdance mixed 
with white lime makes excellent mortar, nearly rc- 
fembling cement. It is proof againd rain and fun, 
and is ufed here to cover and dielter whatever is ex- 
pofed to the weather. We diould rejoice if this 
hint could prove ufeful to the Britidi nation. If 
their country affords black lime, they are polfcdcd 
of a great treafure. 
The ground or dooring of the dove may be of 
beaten clay, or, what is infinitely better, bricks placed 
cdgewifc, or large paving tiles. 
The funnel for the fmoke, or rather the two fun- 
nels, mud be made with great care. Some make 
them terminate in little chimneys, that carry off the 
fmoke above the roof. In the model, they open into 
the room, as the city poor have them ; but in the 
country, and in gentlemen’s houfes, they are on the 
outfide. 
It is of confequence that the little piles which 
fupport the great fquare bricks of the floor be very 
folid, and the bricks very thick and perfcdtly fquare. 
The Chinefe bind them with a fort of cement made 
of white and black lime, fempered with ‘Tong Teoii^ 
which is a kind of varnifh. We are apt to think 
walnut or linfeed oil boiled would do as well. 
As 
