The author assumes that a person who is intelligent enough to make a garden, does not need an arbitrary calendar of operations. Too exact advice is misleading and unpractical. Most of the older gardening books were arranged wholly on the calendar method--giving specific directions for each month in the year. We have now accumulated sufficient fact and experience, however, to enable us to state principles; and these principles can be applied anywhere,--when supplemented by good judgment,--whereas mere rules are arbitrary and generally useless for any other condition than that for which they were specifically made. The regions of gardening.