As, however, cod-liver oil is admitted to be an important medical agent, and as so many eminent medical practitioners have given their decided approbation to its employment, it is of the greatest consequence to have the article in the most perfect state of purity. Under this impression I have for a considerable time been engaged in various methods to accomplish this end, and without occasioning any change in its constituent properties, or altering the relative proportion of the several substances which enter into its formation, I have at length been enabled to obtain the oil from the fresh livers in a state of purity and comparative sapidity which I flatter myself will be universally approved. Its clearness and transparency is equal to that of any other oil even of a vegetable nature; its taste is such that it needs no admixture to disguise it, and it is therefore freed from the suspicion of being, by any combination, deprived of its essential and curative properties. It may be taken, not in the large doses previously administered in the Manchester Infirmary, of one, two, or three table-spoonfuls, two, three, or four times daily, but in that of one, two, or three tea-spoonfuls twice a day, and may, without fear of counteracting its medicinal quality, be agreeably taken in a small quantity of milk, or coffee, or beer. Infusion of orange-peel is a convenient and agreeable vehicle for its administration. Peppermint-water is also a convenient and proper means. If it be employed in the form of an emulsion, care must be taken that no syrup be employed into the constitution of which acid enters, as it would be incompatible with the alkali necessarily used to form the mixture. If the oil be pure and freed from all extraneous matters, and the livers from which it is procured be in a recent and not in a putrid state, there is little apprehension as to any disagreeable effects following its exhibition; in some cases, however, it has been found to disorder the bowels in a slight degree upon commencing its use, but that speedily subsides, and has rarely required the aid of remedies to counteract such effects. Externally it may be used by itself, or in combination with ammonia, or camphor, spermaceti, wax, &c., according to the intention with which it is employed, and which it is hardly necessary to say should be under the direction of a professional adviser. _143, New Bond Street, Feb. 21, 1849._ LONDON: G. J. PALMER, PRINTER, SAVOY STREET, STRAND. _By the same Author._ Third Edition, 12mo., cloth, 5_s._