WALLS, FOUNDATIONS, ETO. 45 
mixed with hot lime and water, are frequently employed for 
greenhouse work, and answer admirably, but one ‘‘ wide” 
course had better be placed on it. A trench about a 
foot wide and Qin. or 10in. deep is taken out and filled 
with the freshly mixed concrete, this being well rammed 
down and levelled, and when ‘set ” the brickwork may be 
commenced. 
In some parts of the country brickwork is done by the 
‘“square,” a square being a piece equal to 10ft. square, or 
100 square feet, and a square of Yin. work contains 1,066 
bricks. Good “stock” bricks can usually be obtained for 
from 25s. to 30s. per 1,000, and the average cost of a square 
of brickwork, including mortar and labour, is from 40s. to 
50s. Good lime mortar ought always to be used, and if 
fresh and ‘‘hot’’ when used so much the better. If the 
bricks can be soaked or wetted before use the mortar will 
take a better hold and bind them very securely together ; a 
very little Portland cement mixed with the mortar causes it 
to set as hard as iron, and make very sound work. 
Where stone is plentiful and cheap this makes just as 
good a wall as bricks, but a stone wall should be somewhat 
thicker than a brick one—16in. or 18in. instead of 9in.—and 
if rough stones are used the mortar must be very good. 
Cement mortar is best. Good concrete also makes a capital 
wall for the purpose under consideration, but plenty of cement 
must be used in order to make sound work ; it is very false 
economy to be too sparing with it. Portland cement is now 
much cheaper than it used to be, and can be bought in large 
quantities at a very low rate; but a great deal of both this 
and labour is required in concrete work, and where good 
sound bricks can be obtained for about 25s. per thousand, or 
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