TRANSACTIONS OF THE SECTIONS. 49 
soctalis, F. M., all known as Mallee Scrub). The other oils were chiefly endowed 
with medicinal characteristics, including several true mints, Mentha Australis, M. 
gracilis, and M. grandiflora ; also some related to plants of the Rue species, and one 
fragrant perfume distilled from the blossoms of the Pittosporum undulatum. Also 
a heavy oil from the bark of the Atherosperma moschatum, possessed of powerful 
medicinal properties. 
The resins and gum-resins include several obtained from the genus Eucalyptus, 
which are powerfully astringent, and more or less soluble in water. Also one from 
the Calhtris verrucosa and cupressiformis of Northern Victoria, the sandarac of 
commerce; one from the Xanthorrhea australis, a balsamic resin containing ben- 
zoic acid, and resembling dragon’s-blood; together with some true gums from the 
genus Acacia, which is well represented in the Australian colonies. 
The following is a list of the oils submitted to investigation, with their verna- 
cular names as far as known, 
Eucalyptus amygdalina (DaudenongPep- Melaleuca ericifolia (Common Tea-tree)* 
permint), M. Wilsoni. 
E. oleosa (Mallee Scrub). M. uncinata. 
E. sideroxylon (Iron-bark). M. genistifolia. 
E. zonicalyx (White Gum). IM. squarrosa. 
E. globulus (Blue Gum). Atherosperma moschatum (Sassafras). 
E. corymbosa (Blood-wood). Prostanthera lasianthos. 
E. fabrorum (Stringy-bark). P. rotundifolia. 
E. fissilis (Messmate). Mentha australis, 
E.. odorata LEeppenuant)- . M. grandiflora. 
E. Woollsit (W oolly-butt). M. gracilis. 
E. rostrata (Red Gum). Zieria lanceolata. 
E. viminalis (Manna Gum). Eristemon squameus. 
Melaleuca linariifolia. Pittosporum undulatum. 
M. curvifolia. 
Details of a Photolithographic Process, as adopted by the Government of 
Victoria, for the publication of Maps. By J. W. Osporne. 
The author referred to his having read a paper ae this subject before the Royal 
Society of Victoria, in November 1859, his process having been previously patented 
in the Colony on the 1st of September, 1859. The process had then been adopted 
by the Government, and had come info active use in the Department of Lands and 
Survey at Melbourne. By its means many hundreds of maps had been published, 
of a quality and for a price which left nothing to be desired. The Victorian 
Government had recently erected an office, the design and arrangements of which 
were admirably adapted for the prosecution of this description of work. To pro- 
duce a photolithographic copy with or without reduction, the original map or en- 
graving was extended upon an upright board, and by the help of a camera placed 
opposite, a negative of it was taken. A sheet of paper was now prepared by coat- 
ing one of its surfaces with a solution of gelatine in water, to which a certain pro- 
portion of bichromate of potash and liquid albumen had been added. The surface 
thus prepared, after it had dried in a dark and warm room, was sensitive to the 
chemical action of light, and the next operation was to expose to the sun’s rays a 
suitable piece of it, in an ordinary pressure frame, under the negative already obtained. 
The positive ee print thus produced was inked all over with lithographic 
re-transfer ink, and was then placed floating upon boiling water, with its inky side 
upwards and unwetted. After a short time the gelatine would be found to have 
softened and swelled under the ink, save where the light had acted, the ‘organic 
matter upon such places haying suffered a peculiar change. Another effect of the 
boiling water was to coagulate the albumen in the film. When sufficiently soaked, 
the ees ink was removed by means of a sponge, and the result was a pho- 
tographic print in greasy ink; inasmuch as the latter substance adhered firmly to 
all the unsoftened, or, in other words, the altered parts of the gelatinous coating. 
It would also be found that the delineation thus obtained was upon a smooth sur- 
4 
1862. 
