But it is under the third point of view that the preservative process is more important and interesting, inasmuch as it admits of a far more extensive application. We speak of the abstraction of air. Atmospheric air affects dead organic matter chiefly through the agency of the oxygen which forms one of its constituents; and it is principally to insure the expulsion of oxygen that air is excluded. The examples which illustrate the resulting effects are numerous and varied. Eggs have been varnished so as to exclude air, and have retained the vital principle in the chick for years; and it is a familiar domestic practice, to butter the outside of eggs as a means of keeping them. The canisters of preserved provisions, however, are the most direct and valuable result of the antiseptic action by exclusion of air. The Exhibition Jury on Class 3, in their Report on this subject, speak thus warmly thereupon:—'It is impossible to overestimate the importance of these preparations. The invention of the process by which animal and vegetable food is preserved in a fresh and sweet state for an indefinite period, has only been applied practically during the last twenty-five years, and is intimately connected with the annals of arctic discovery. The active measures taken to discover a north-west passage, and to prosecute scientific research, in all but inaccessible regions, first created a demand for this sort of food; and the Admiralty stimulated the manufacturers to great perfection in the art. As soon as the value of these preparations in cold climates became generally admitted, their use was extended to hot ones, and for the sick on board ship under all circumstances. Hitherto they had been employed only as a substitute for salt beef or pork at sea, and if eaten on shore, it was at first as a curiosity merely. Their utility in hot climates, however, speedily became evident; especially in India, where European families are scattered, and where, consequently, on the slaughter of a large animal, more is wasted than can be consumed by a family of the ordinary number.'

Whatever improvements may have been introduced by later manufacturers, the principle involved in the meat-preserving processes is nearly as M. Appert established it forty years ago. His plan consisted in removing the bones from the meat; boiling it to nearly as great a degree as if intended for immediate consumption; putting it into jars; filling up the jars completely with a broth or jelly prepared from portions of the same meat; corking the jars closely; incasing the corks with a luting formed of quicksilver and cheese; placing the corked jars in a boiler of cold water; boiling the water and its contents for an hour; and then allowing the cooling process to supervene very gradually.

Until the recent disclosures concerning the preserved meats in the government depôts, the extent of the manufacture, or rather preparation, was very little known to the general public. In the last week of 1851, an examination, consequent on certain suspicions which had been entertained, was commenced at the victualling establishment at Gosport. The canisters—for since Appert's time stone jars have been generally superseded by tin canisters—contain on an average about 10 pounds each; and out of 643 of these which were opened on the first day's examination, no fewer than 573 were condemned as being utterly unfit for food. On the next day, 734 were condemned out of 779; and by the fourth day, the number examined had risen to 2707, of which only 197 were deemed fit for food. Such wretched offal had been packed in the canisters, instead of good meat, that the stench arising from the decomposing mass was most revolting; the examiners were compelled to use Sir William Burnett's disinfecting fluid abundantly, and even to suspend their labours for two or three days under fear of infection. The canisters formed part of a supply sent in by a contractor in November 1850, under a warrant that the contents would remain good for five years; the filling of the canisters was understood to have been effected at Galatz, in Moldavia, but the contractor was in England. The supply amounted to 6000 canisters, all of which had to be examined, and out of which only a few hundred were found to contain substances fit for food. Instead of good meat, or in addition to a small quantity of good meat, the examiners found lung, liver, heart, tongue, kidney, tendon, ligament, palate, fat, tallow, coagulated blood, and even a piece of leather—all in a state of such loathsome putridity as to render the office of the examiners a terrible one.

Of course nothing can be predicated from such atrocities as these against the wholesomeness of preserved food; they prove only the necessity of caution in making the government contracts, and in accepting the supplies. The Admiralty shewed, during subsequent discussions, that large supplies had been received from various quarters for several years, for use on shipboard in long voyages and on arctic expeditions; that these had turned out well; and that the contractor who was disgraced in the present instance, was among those who had before fulfilled his contracts properly. Fortunately, there is no evidence that serious evil had resulted from the supply of the canisters to ships; the discovery was made in time to serve as a useful lesson in future to government officials and to unprincipled contractors.

The jury report before adverted to, points out how cheap and economical these preserved meats really are, from the circumstance, that all that is eatable is so well brought into use. It is affirmed by the manufacturers, that meat in this form supplies troops and ships with a cheaper animal diet than salt provisions, by avoiding the expense of casks, leakage, brine, bone, shrinkage, stowage, &c., which are all heavy items, and entail great waste and expenditure; and by a canister of the former being so much smaller than a cask of the latter, in the event of one bad piece of meat tainting the whole contents. The contents of all the cases, when opened, are found to have lost much of the freshness in taste and flavour peculiar to newly-killed meat; they are always soft, and eat as if overdone. As a matter of choice, therefore, few or no persons would prefer meat in this state to the ordinary unpacked and recently-cooked state. But the important fact to bear in mind is, that the nutritious principles are preserved; as nutriment, they are unexceptionable, and they are often pleasantly seasoned and flavoured.

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