ESSENTIAL OILS.
EXTRACTION FROM PLANTS. The methods of producing perfumes and medicinal substances' from essential oils were described last evening by Mi. W. F. Short, lecturing in the University College Hall under the auspices of the Auckland Institute. Distillation was the method used to extract such coarse orts as eucalyptus, a current of steam cariying the liberated essence with it to a condenser and thence to a receiver, where the floating oil was drawn off from the surface of the water. Tn the case ot the delicately-perfumed oils such as those occurring in roses, violets, jasmine, a more elaborate method was employed. This consisted in placing the petals on sheets of glass smeared with refined animal fat. so that the essential oil was drawn from the petal. The essential oil was then extracted from the fat bv solution in alcohol, the fat being insoluble in that medium. Distillation of the alcohol Rave the pure essential oil. Another method employed in extracting the oil from fruit, as in the case of citrus fruits yielding the familiar citronella, was by mechanical expression.
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New Zealand Herald, Volume LXV, Issue 19976, 19 June 1928, Page 11
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180ESSENTIAL OILS. New Zealand Herald, Volume LXV, Issue 19976, 19 June 1928, Page 11
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