EXTRACTS.

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EXTRACTS.

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Extraets are usually prepared by cvaporatingthe expressed Juices of plants, or their infusionsand decoctions in water, proof-spirit, or rectifi-ed spirit, at a temperature not exceeding- 212°F. by means of a vapour-bath. Most of them,however, may be obtained of greatly superisrquality by the process of evaporation in vacuo.And the extraets of expressed Juices cannot,perhaps, be better prepared than by spontane-ous evaporation in shallow vessels, exposed toa current of air. Extraets should be evaporat-ed to such a consistence as to form a firm pill-mass when cold.

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EXTRACTUM ACONITI.

Take of the leaves of Monkshood, fresh, anyconvenient quantity ; beat them into a pulp ;express the juice ; subjeet the residuum topercolation with rectified spirit, so long asthe spirit passes materially coloured; unitethe expressed juice and the spirituous infu-sion ; filter; distil off the spirit; and evapo-rate the residuum in the vapour-bath, takingcare to remove the vessel from the heat sosoon as the due degree of consistence shallbe attained.

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EXTRACTUM ANTHEMIDIS.

Take of Chamomile, a pound; boil it with a