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I have already referred to the way in which this work has been written—records of facts have been made simultaneously with an appeal for additional facts, in other words, the whole of the facts submitted were not available when publication began.

First of all, the help that I have received from Miss Margaret Flockton, the artist of this work, is immense, and it speaks for itself. She is practically a joint author. Her drawings are alike beautiful and artistic, and the botanist will appreciate them because of their fidelity to nature. As knowledge progressed, and perhaps long after a loan specimen had been returned to its owner, the faithfulness of the drawing sometimes brought out a hitherto unsuspected point. I have reproduced specimens of the fine series of coloured drawings of seedlings at different stages, on which she has been engaged for over twenty years, and the work of Miss Ethel King and Miss Phyllis Clarke on the same series, though very much less in extent, is worthy of the greatest praise.

Mr. William Faris Blakely, in addition to his other duties, has been my assistant for Eucalyptus since 1913, and has given me increasing help since that date, so that he has been quite indispensable to me. In return, I have instructed him in the subject to the best of my ability. Without for a moment presuming to dictate his future course of action, I hand over the unrivalled Eucalyptus collection of the National Herbarium to him, in a special sense, for he is acquainted with it as no one else is, and he is entirely competent. I am confident that he will successfully add to, in his own way, the Eucalyptus work carried on by me at the National Herbarium for nearly thirty years, and at the Technological Museum for ten years before that.

I never forget the early pioneering work that my old colleague, Mr. Henry Deane, M.A., and I undertook in the eighties and nineties, and some of this work is commemorated by species and varieties which bear our joint names.

I do not think that a single Part has been published which does not show my indebtedness to Mr. R. H. Cambage. No botanist has helped me so much as he, not only with critical specimens and valuable notes, but many observations are the result of consultations at various times with this valued colleague, whose knowledge of the genus is profound. This can be seen in part from the quotations I have so freely made from his works. It would be simply impossible to fully state my indebtedness to him. A bibliography of his Eucalyptus work will be found in another place.

I most gratefully do acknowledge the assistance of Dr. T. L. Bancroft, of Eidsvold, Queensland, who has supplied me for many years with herbarium specimens, heavy axe-cuts of bark and timber, photographs or negatives or both, and valuable notes—all illustrative and to the point. No man could have a more responsible and unselfish correspondent than he, who is well known to zoologists and physiologists also as one who delights in supplying material to facilitate the studies of others, even if they interrupt his own.

Professor J. B. Cleland has been a similarly unselfish collector of the same type, and it is a great pleasure to acknowledge his kind assistance.

For specimens and notes which have enabled me to clear up many points in regard to Northern Territory species, I am indebted to Dr. H. I. Jensen, Messrs. Charles Ernest Frederick Allen and Gerald Freer Hill. These gentlemen have travelled great distances over difficult country and have always been patient in replying to my inquiries. Dr. Jensen's work on the geological formations on which various Eucalypts are found is largely of a pioneering character, and will be found to be freely quoted in Part LXVII.

From the Forestry authorities, particularly of Western Australia and my own State, I received active support. As regards the former State, Australian forestry and botany both deplored the transfer of Mr. C. E. Lane-Poole, the Conservator of Forests, who, recognising the fact that sound forestry practice cannot exist without a sound knowledge of the taxonomy, morphology and ecology of Eucalyptus, helped

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me with notes, photographs and adequate specimens. In the same public spirit I have been helped by his successor, Mr. Stephen L. Kessell, and his botanical collector, Mr. Charles Austin Gardner, who, by the judicious collection of specimens and valuable field-notes concerning Western Australian species in general, has valuably supplemented the researches in tropical Western Australia of Mr. W. V. Fitzgerald, and enabled one to co-ordinate the work of collectors in the Northern Territory and tropical Queensland. Mr. W. C. Grasby, friend of everybody who desires to study the plants of Western Australia, has provided many specimens and notes, and his name often occurs in these pages.

In South Australia, Mr. Walter Gill, Conservator of Forests of that State, has helped me for at least thirty years. In Victoria I have had some assistance from Mr. A. D. Hardy, of the Forestry Department. The co-operation of Mr. R. D. Hay, Chairman of the Forestry Commission of my own State, and a fellow-worker for many years, has been cordial all along. The specimens sent by each Forester have been referred to under each species concerned; the work of Mr. W. A. W. de Beuzeville has been especially note-worthy.

The Government Botanists of the various States have all been most kind in presenting and lending specimens, and in supplying information. As regards Melbourne, I mention the late Mr. J. G. Luehmann Professor Ewart and his successor, Mr. W. Laidlaw. In Adelaide, Mr. J. M. Black, although occupying no official position, does much public botanical work at his own expense, while Mr. L. Rodway, the honorary Government Botanist of Tasmania, could not have been more helpful if he had been endowed with adequate public funds. Last, but not least, let me acknowledge the great help I have received from Mr. C. T. White, of Brisbane, who succeeded his grandfather, Mr. F. M. Bailey, in the office of Government Botanist. In return for their kindness, I can only hope that what I have written may be of assistance to my colleagues in the compilation of the Floras of their respective States.

The sowing of seeds, and the welfare of the seedlings have necessitated the greatest care, extending over a long period of years. Sometimes an individual plant has had to be kept in the same pot under observation for over seven years. I am greatly indebted to Gardeners Sydney Smith, Ralph Tate, and Charles Woolnough, while the general supervision of Mr. E. N. Ward, the Superintendent and now Curator of the Sydney Botanic Gardens, has been much more than nominal.

To successive Librarians of the Botanic Gardens, viz., the late Miss Amelia Maud Jenner, who died on 23rd February, 1918 (Parts VI to XXXIV), Miss R. M. Breading (now Mrs. McKinnon) (Parts XXXV to XLIX), and Miss M. Merrick (Part L to end), I am indebted more than I can express. These ladies have helped me by hunting up references, by typing confused (sometimes very confused) manuscript, and reading the proofs. To Mr. Keith E. Rogers I am indebted for the reading of proofs of some Parts, and to Mr. Robert H. Anderson of others, and to the latter I am indebted for useful compilation work that I have elsewhere acknowledged.

My own daughter, Miss Acacia Dorothy Maiden, B.A., has often rendered useful service by undertaking translations into and from the Latin, to save me time.

As a rule I have acknowledged the help I have got from my friends, when speaking of their specimens, and hundreds of names will be found to be quoted in this way. If I have omitted any names I ought to have inserted, I shall be very sorry.