4 
WRITERS ON THE GENUS. 
Though so near and so similar in other respects, they are therefore not eucalypts. 
Some of the eucalypts in a sub-section called Eudesmieae have indentations in the 
rim of the calyx tube (seed-cup) and markings on the operculum (lid) suggestive 
of ancestral division into sepals and petals. When or why these organs changed 
to the undivided state is an open question for further research; but that the outer 
operculum represents the sepals and the inner operculum the petals of the ancient 
flower is now accepted by botanists as a fair inference from the evidence as a 
whole. 
The distinguished botanist Robert Brown, and others following, accepted 
L’Heritier’s name and settled it as the permanent title of the genus. The father 
of Eucalyptology, the late Baron Ferdinand von Mueller, derived from it the 
Anglicized forms eucalypt and eucalypts to denote the species when regarded 
singly or collectively. British and American writers of highest standing have 
followed Mueller in the use of these forms. The Latin plural Eucalypti appears 
occasionally in hooks and papers, but has never found favour in the learned 
tradition. It thus appears that Eucalyptus, eucalypt, and eucalypts are estab¬ 
lished by the highest authority as the correct and proper terms to be used when 
speaking or writing in the English language about these trees or any of their 
products. 
WORKERS AND WRITERS ON THE GENUS. 
The elucidation of the eucalypts has now been in progress for over a century. 
It has commanded the interest and labours of many able and learned men. Baron 
Ferdinand von Mueller in his Eucalypt agraphia. Select Extra-Tropical Plants, 
and other writings; George Bentham inVol. iii. of the Flora Australiensis ; J. D. 
Hooker in his Flora Tasmaniae; Dr. William Woolls in his Lectures ; F. M. 
Bailey in his Queensland Flora; A. J. McClatchie in his Eucalypts Cultivated 
in the United States; Charles Naudin writing in French on species cultivated in 
France; and several other writers have left us literature on the subject much of 
which will hold a permanent place in the classics of science. Amongst more recent 
writers on the genus the place of chief distinction easily belongs to J. IT. Maiden, 
F.R.S., who was for many years Director of the Sydney Botanic Gardens and 
Government Botanist for the State of New South Wales; while especial men¬ 
tion must also be made of R. T. Baker, F.L.S., and II. G. Smith, F.C.S., joint 
workers during a long period in the Sydney Technological Museum. J. TI. 
Maiden in his Critical Revision of the Genus Eucalyptus and his Forest Flora of 
New South Wales, two elaborate and eminently well-illustrated works, has brought 
together from all sources an immense amount of information in addition to his own 
intimate personal knowledge of the trees. A work that so completely lays under 
tribute the collections and writings of all the earlier students of the genus as well 
as the labours and contributions of living botanists and foresters as does the Critical 
Revision will be supplemented, as all progressive science must be; but as an 
encyclopaedia of information to the date of its completion it can never be dis¬ 
placed or superseded. Messrs. Baker and Smith in their work entitled A 
Research on the Eucalypts and their Essential Oils (2nd edition 1920) and other 
writings have developed the chemistry as well as the botany of the subject. They 
