The exploration of every new district has afforded ample proof of the existence of species in every department of zoology with which we were previously unacquainted. Under these circumstances, I do not consider my work to be in any way complete, or that it comprises nearly the whole of the Mammals of a country of which so much has yet to be traversed; but I bring it to a close after an interval of eighteen years since it's commencement, during which constant attention has been given to the subject, as treating upon the genera and species known up to the present time. If my life be prolonged, and the blessing of health be continued to me, I propose, as in the case of the 'Birds of Australia,' to keep the subject complete, by issuing a supplementary part, from time to time, should sufficient new materials be acquired to enable me so to do.
As with regard to my other publications, so also with this, I have to offer my best thanks to many persons for the kind and friendly assistance they have rendered me in prosecuting my labours on the 'Mammals of Australia.' I cannot, therefore, close these remarks without recording my obligations to Professor Owen, Dr. Gray, and G. R. Waterhouse, Esq., of the British Museum; to Ronald C. Gunn, Esq., of Launceston; the Rev. T. J. Ewing and Dr. Milligan of Hobart Town; to Dr. Bennett, W. S. MacLeay, Esq., Gerard Krefft, Esq., the late Dr. Ludwig Becker, W. S. Wall, Esq., the authorities of the Australian Museum, and the late Frederick Strange, of New South Wales; to Charles Coxen, Esq., of Queensland; John
