[2733] Owing solely, in all probability, to its name, “blood-stone.”
[2734] Ajasson is at a loss to know whether this is our Anthracite, a non-bituminous coal, or some kind of bituminous coal. Delafosse takes it to be pit-coal.
[2735] Or “eagle-stone.” It is a Geodes, mentioned in Chapter [23] of this Book, a globular mass of clay iron-stone. Sometimes it is hollow within, and sometimes it encloses another stone, or a little water, or some mineral dust.
[2736] Chapter 4.
[2737] See B. iv. c. 2.
[2738] A kind of pumice, Ajasson thinks, or porous feldspathic scoria from volcanos.
[2740] In Chapter [37] of this Book.
[2741] See B. xxiii. cc. 45, 80.
[2742] Probably of a similar nature to the Samian stone.