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                   APPENDIX.
   CHIMNEY Tops.-The cuts here given represent tops for chim-
 neys made of terra-cotta, vitrified, so that they are not liable to
 injury from the action of coal gas, which is so injurious to brick
 chimneys.   As an article of ornament, we certainly approve of
 their use, particularly on the cottage or villa residence, as they
 make an appropriate and light finish to chimneys that cannot be
 produced in brick.   In England they are considered indispensable
 to the finish of a cottage building.
                              For cottages in the Gothic style,
                            these tops should be at least five feet
                            high, with an additional base of brick
                            of about two feet; in the Italian style,
                            from three to four feet is a proper
                            height.
                             FLUES AND PIPEs-Latterly, smoke
                            and air flues have been made of terra-
            FIG. 189.       cotta, of dimensions suitable for all
purposes.   They are made in pieces of about 18 inches in length
and from 4~by 8 to 12 by 18 inches sectional area.
  The value and economy of drain pipes made of this material is
too well known to need comment here.
  Much credit is due to Mr. S. A. Harrison, of Philadelphia, for
the manner in which he has conducted the manufacture and sale of
the above articles.  His warerooms contain a collection of stat-
nary, vases, etc., of terra-cotta, worthy of a visit even from persons
not wishing to purchase.
FIG. ~9O.