174 



Food for Plants. 



Cement 1 bushel and sand 2 bushels will cover 31/2 

 square yards 1 inch tJiick, 41/2 square yards % inch thick, 

 and 6% square yards 1/2 "i^h thick. One bushel cement 

 and 1 of sand will cover 2i/^ square yards 1 inch thick, 3 

 square yards % inch thick, and 41^4 square yards 1/0 ^^^^^ 

 thick. 



Number of Brick Required to Construct Any Building. 



(Reckoning 7 Brick to Each Superficial Foot) 



