sists of alternate layers of brick * headers' and 1 stretchers,' aa being the 4 headers,' and bb the 1 stretchers.'

Example 55, fig. 55, shews a specimen of 1 Flemish' bond, in which each row is made up of1 stretchers' and i headers' laid alternately; a a are

fig. 55.

the former, bb the latter. In delineating plans, various methods are in use for filling up. Thus, in

Example 56, fig. 56, a represents the method of filling up walls in a

fig. 56.

plan by means of cross lines, b where the whole is dark, all [openings, as doors and windows, being left unshaded. The method of shewing a chimney flue in the thickness of a wall is shewn at c; another method in d. Stone work may be classed into three different kinds, as generally adopted; these are * rubble,'1 coursed,' and ' ashlar.'

Example 57, fig. 57, shews the method of delineating ' rubble work,' in which the wall is composed of stones of all sizes and shapes.

fig. 57. fig. 58. fig. 59.

Example 58, fig. 58, shews the method of delineating 1 coursed work,' in which the stones are, to a certain extent, squared and set in courses: hence the term.

Example 59, fig. 59, shews the method of delineating * ashlar work,' in which all the stones are squared up to certain given sizes, and set in regular courses.

Example 60, fig. 60, shews the method of delineating * vermiculated' work, in which the surface of the blocks are left with rough projections, a

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