Nature of Stone.

Bulk of Water absorbed as compared with bulk of stone per cent.

Authority.

Several specimens of good granite and syenite ....

1/2 per cent

w

Do. do. indifferent specimens

1 „

w

Do. do. very bad

3 „

w

Trap and basalt ....

A trace .

w

Do. do......

1/10 to 1/5 p. c.

Sandstones.

Craigleith - Very durable .

8 per cent

c

Park Spring Do.

8

c

Giffneuk - Moderately durable .

10

c

Heddon Do.

10.4 ,,

c

Kenton Do,

9.9 ,,

c

Mansfield Do.

10.4 ,,

c

Hassock - Very bad

20.0 ,,

W

Limestones.

Marble ......

A trace.

Portland - Very durable .

13 .5 per cent

c

Ancaster - Durable ....

16.6 „

c

Bath (Boxground) ....

17 „

c

Ketton - Durable ....

15.1 „

Chilmark . ...

8.6 „

c

Roche Abbey - Durable .

17.2 „

c

Kent Rag Do.

1 1/3 .,

w

Ransome's stone (artificial)

12

w

Victoria Do. do.

7.6 „

W

Apoenite Do. do.

12 „

W

W, Deduced from Experiments detailed in Wray On Stone. C, Royal Commission on Stone for Houses of Parliament.

Weight Of Stone

A long list of stones, giving the weight per cubic foot of each, was prepared by Mr. C. H. Smith for the Mineral Statistics published at the Museum of Practical Geology.

The information contained in that list has been given in the Tables, pp. 18, 39, 67, et seq., and it will therefore not be repeated.

The following Table shows approximately the weights of different classes of stone, and may be useful.