When the first edition of this work was published in 1902 it-was decided to subordinate the vernacular names to the scientific, as it was found that no uniformity of results were obtainable if the vernacular names were relied upon to any extent for systematic and industrial purposes.

In a work with a commercial setting such as this, the idea was no doubt somewhat revolutionary at that time, but after some years' experience we are quite satisfied with the result of that action, in so far as it concerns the Eucalyptus oil industry, and we trust that the method will be more extensively adopted with the Eucalypts in other directions, especially the timber trades.

The number of distinct species of Eucalypts is so large that sufficient common names could only with difficulty be invented in order that each species may have a distinctive appellation, and consequently we often see a conglomeration of species with different economics under the one common name. There are, for instance, several species known as "Blue Gums," many others as "Red Gums," "White Gums," "Boxes," "Peppermints," "Mallees," "Iron-barks," or "Bloodwoods," so that in this direction identification with any degree of success for accurate economic purposes becomes quite hopeless. Some attempt has been made to overcome the difficulty by employing an adjective, so that we have "White Box," "Murray Red Gum," "Broad-leaved Peppermint," and so on. It is just as easy, however, to say Eucalyptus rostrata as " Murray Red Gum," or Eucalyptus dives instead of "Broad-leaved Peppermint" or Eucalyptus Macarthuri instead of " Paddy River Box."

In restricted areas no doubt the common names for Eucalyptus trees do have some utility, because the number of distinct species in any one district is limited, but it is when local names found useful for discriminative purposes in one district are applied to altogether different trees growing in quite another locality that grave mistakes occur.

Most of the scientific names as applied to Eucalyptus species are not difficult for the commercial man to learn, and our experience has shown that their employment in commerce has considerable advantages. It is now customary with the larger manufacturers of Eucalyptus oils to indicate the origin of their products by using the scientific names, and not the vernacular, and even the small distiller in the "bush" has become familiar with the botanical name of the species he is working, and employs it for purposes of trade, for the reason that purchasers of oil prefer now to buy only on scientific names. In this way the article produced is easy to control, because the scientific name not only becomes distinctive for the tree, but means a standard for the product also, the economics for any individual species being so well defined.

It is thus evident that if the scientific name for any particular Eucalypt is utilised that the economics will be such that no difficulty or misunderstanding can arise either to the manufacturer or to the purchaser.

In this second edition of the work, therefore, the scientific names for the species are again emphasised, as the economic advantages to be derived by following this method are so great.