g to the other, the usage in each class having been fixed long
ago.

7. Finally, propriety will be due to natural causes if, for example, in
the case of all sacred precincts we select very healthy neighbourhoods
with suitable springs of water in the places where the fanes are to be
built, particularly in the case of those to Aesculapius and to Health,
gods by whose healing powers great numbers of the sick are apparently
cured. For when their diseased bodies are transferred from an unhealthy
to a healthy spot, and treated with waters from health-giving springs,
they will the more speedily grow well. The result will be that the
divinity will stand in higher esteem and find his dignity increased, all
owing to the nature of his site. There will also be natural propriety in
using an eastern light for bedrooms and libraries, a western light in
winter for baths and winter apartments, and a northern light for picture
galleries and other places in which a steady light is needed; for that
quarter of the sky grows neither light nor dark with the course of the
sun, but remains steady and unshifting all day long.

8. Economy denotes the proper management of materials and of site, as
well as a thrifty balancing of cost and common sense in the construction
of works. This will be observed if, in the first place, the architect
does not demand things which cannot be found or made ready without great
expense. For example: it is not everywhere that there is plenty of
pitsand, rubble, fir, clear fir, and marble, since they are produced in
different places and to assemble them is difficult and costly. Where
there is no pitsand, we must use the kinds washed up by rivers or by the
sea; the lack of fir and clear fir may be evaded by using cypress,
poplar, elm, or pine; and other problems we must solve in similar ways.

9. A second stage in Economy is reached when we have to plan the
different kinds of dwellings suitable for ordinary householders, for
great wealth, or for the high position of the statesman. A house in town
obviously calls for one form of construction; that into which stream the
products of country estates requires another; this will not be the same
in the case of money-lenders and still different for the opulent and
luxurious; for the powers under whose deliberations the commonwealth is
guided dwellings are to be provided according to their special needs:
and, in a word, the proper form of economy must be observed in building