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wished to show, that this particular oil might be substituted for 

 the comparatively costly oil of cajuput. obtained in some parts 

 of India, and rather extensively used in some countries for 

 medical purposes. For the exhibition of 1862 about thirty 

 different oils were prepared by the same gentleman, chiefly from 

 various eucalypts, and from material mostly selected by myself 

 for the purpose. This led not merely to determining the per- 

 centage of yield, but also to extensive experiments, here chiefly 

 by Messrs. Bosisto and Osborne, and in London by Dr. Glad- 

 stone, in reference to the illuminating power, the solvent pro- 

 perties, and other special qualities of each of these oils. The 

 principal results of these experiments were recorded in reports 

 of the exhibition jurors at the time. Mr. Bosisto, with great 

 sagacity and a commendable perseverance, but also at first 

 with much sacrifice of capital, carried his researches so far as 

 to give to them great utilitarian value and mercantile dimen- 

 sions; moreover, he patented a process, by which he was 

 enabled to derive from the eucalyptus foliage the greatest 

 amount of the purest essential oil with the least consumption 

 of fuel and application of labour. Under this process it be- 

 came possible to produce the oil at a price so cheap as to 

 allow the article to be used in various branches of art for 

 instance, in the manufacture of scented soap, it having been 

 ascertained that this oil surpassed any other in value for 

 diluting the oils of roses, of orange-flowers and other very 

 costly oils, for which purposes it proved far more valuable 

 than the oil of rosemary and other ethereal oils hitherto 

 used. Suddenly, then, such a demand arose, that our thought- 

 ful and enterprising fellow-citizen could export already about 

 9000 Ibs. to England and 3000 Ibs. to foreign ports, though 

 even now this oil is as yet but very imperfectly known 

 abroad. The average quantity now produced at his establish- 

 ment, for export, is 700 Ibs. per month. Alcoholic extracts of 

 the febrifugal foliage of Eucalyptus globulus and E. amyg- 

 dalina have also been exported in quantity by the same 

 gentleman to England, Germany and America. Similar sub- 

 stances from various melaleucas might be added. Originally 

 an opinion was entertained, that all the eucalyptus oils have 

 great resemblance to each other; such, however, proved not 

 to be the case when it came to accurate experimental tests. 

 Thus, for instance, the oil, which in such rich percentage is 

 obtained from Eucalyptus amygdalina, though excellent for 

 diluting the most delicate essential oils, is of far less value as 

 a solvent for resins in the fabrication of select varnishes. For 



