Incidentally, the chimneys of an old house should be examined carefully.  Built in the days before separate flues and flue tiles, their mortar may have lost its binding strength and so a smoke test is advisable.  Close all fireplaces except one and start a lively fire in it.  When it is well under way, toss on some scraps of roofing paper.  Then cover the top of the chimney.  If there are any fissures in the chimney, your eyes and nose will leave you in no doubt.  You cannot mistake the pungent odor of burning tar and its bluish smoke is easy to see.  Trace these to the points where they leak from the chimney and mark the spots.  Complete examination will tell whether repointing will suffice or whether rebuilding is necessary.

The condition of the plaster on walls and ceilings of rooms can be easily appraised.  It is reasonable to expect cracks and that some of it will be so loose as to need replacing.  Removing it all and starting afresh, however, is only advisable where a house has reached about the last stages of disrepair.

Partitions of even the simplest feather-board paneling should be preserved as well as interior trim, doors, and flooring.  The same applies to old hardware, as a house with all original wrought-iron hinges, latches, and locks is both rare and valuable.  Notice whether the floors are of old wide boards laid random width and held in place by wrought-iron nails.  In houses antedating 1800, the floors in certain localities were of hardwood.  Sometimes several varieties were used indiscriminately.  With all their irregularities, they become a very pleasing feature when well scrubbed and oiled or waxed.  Like fireplaces, they are sometimes concealed but it is an easy matter to remove the new flooring.

The soundness and safety of stairways can only be determined by direct inspection.  If treads move beneath the feet, additional nailing is needed and possibly new supports.  Step easily on those leading to the cellar.  They are often somewhat rotten and may collapse.

If window glass is of the old, wavy, off-color sort, full of the bubbles, sand pits, and creases that characterized its production in early days, make sure that such panes are not discarded.  Workmen view them with complete scorn and will cast them aside if not put under stern injunctions.  “I never found that it kept out the cold any better than a good new piece,” snorted one disgustedly when we suggested that he putty a fine “bull’s eye” pane with a slight crack.

Sometimes part of the interior trim will have been replaced by modern substitutes, but a good carpenter working under an architect can match that still remaining.  Likewise, later additions not in keeping with the original, such as porches, sheds, wings, and illogical partitions, can be readily removed with little damage to the house itself.

As one goes about an old house it is well to be on the look out for signs of vermin, both animal and insect.  With the former, traps and prepared bait will suffice.  The latter require the services of an exterminator or some one skilled in the use of hydrocyanic acid gas.  Such insects go deep into the cracks of woodwork and beams.  Ordinary fumigating will not eradicate them.  A single session with this deadly gas, however, will rid the house both of these pests and their eggs.