10. The following proportions and cost of materials, and amount of labor required to lay 1 perch of rubble masonry, are reasonably accurate, and will serve to give an idea of how to estimate such work.

Cost of Rubble Masonry. Using l-to-3 Lime Mortar.

1 perch stone (25 cubic feet) delivered at work.....

$1.25

1 bushel lime........

.25

1/6 load of sand, at $1.50 per load.......

.25

1/3 day mason's labor, at $2.50 per day......

.83

1/4 day helper's labor, at $1.50 per day.........

.38

Total cost...........................

$2.96

Using 1-to-3 Portland Cement Mortar.

1 perch stone........

$1.25

1/2 barrel Portland cement, at $2.60 per barrel.....

1.30

1/6 load sand, at $1.50 per load......

.25

1/3 day mason's labor, at $2.50 per day......

.83

1/4 day helper's labor, at $1.50 per day......

.38

Total cost...........

$4.01

Using- l-to-3 Rosendale Cement Mortar.

1 perch stone.......

$1.25

1/2 barrel Rosendale cement, at $1.25 per barrel.......

.63

1/6 load sand, at $1.50 per load....

.25

1/3 day mason's labor, at $2.50 per day.......

.83

1/4 day helper's labor, at $1.50 per day......

.38

Total cost............

$3.34