fire-proof. A second is, that a very supe- must be obvious to every candid reader that neither fire can bor of one is not adequate to the purpose. The invention is rior wall to that formed by plastering on wooden lath is ob- consume, or rats penetrate, a wall of this construction. The simply a… … tion will beeasily understood by the aid of the accompany- external heat, that only a fire of such intensity as to convert the timbers into charcoal, could weaken the main structure. Such an effect could scarcely be produced by the burning of joists and spaces, and also of a vertical wall with…
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