The weights of various limes and cements are given approximately below. The precise weight varies, of course, according to degree of freshness, size of lumps, fineness of grinding, etc.

Quicklime in Small Lumps (Fresh).

Weight per Foot Cube in Lbs.

White chalk lime .....

39

Grey ,, ,, (Hailing)..

44

Portland stone lime ....

47

Blue lias ,, ,, (various)

58 to 70

Quicklime, Ground (Fresh).

Weight per Foot Cube in Lbs.

Weight per Striked Bushel in Lbs. 1

Blue Lias lime (various)..

49 to 68

63 to 87

Grey chalk lime..

43

55

Arden „ „...

68

87

Cements, etc.

Weight per

Foot Cube in Lbs.

Weight per

Trade Bushel in Lbs.1

Weight per

Striked Bushel in Lbs.

Portland..

74 to l011/2

100

95 to 130

Roman ....

60 to 621/2

70

77 to 80

Medina ....

61

68

78

Keene's ....

64

75

82

Parian..

60

66

77

Plaster of Paris..

50

Sold by weight.

64

Whiting ....

64

Do.

82

1 See page 158.