The system of adulteration is so wide-spread, and embraces so many of the items of the daily meal, that we scarcely know where to begin--what corner of the veil first to lift. Let us hold up the cruet-frame, for example, and analyze its contents. There is mustard, pepper (black and cayenne), vinegar, anchovy and Harvey sauce--so thinks the unsuspecting reader; let us show him what else beside. To begin with mustard. "Best Durham," or "Superfine Durham," no doubt it was purchased for; but we will summarily dismiss this substance by stating that it is impossible to procure it pure at all: out of forty-two samples bought by Dr. Hassall at the best as well as inferior shops, all were more or less adulterated with wheaten flour for bulk, and with turmeric for colour. Vinegar also suffers a double adulteration. It is first watered, and then pungency is given to it by the addition of sulphuric acid. A small quantity of this acid is allowed by law; and this is frequently trebled by the victuallers. The pepper-castor is another stronghold of fraud--fraud so long and openly practised, that we question if the great mass of the perpetrators even think they are doing wrong. Among the milder forms of sophistication to which this article is subjected, are to be found such ingredients as wheaten flour, ground rice, ground mustard-seeds, and linseed-meal. The grocer maintains a certain reserve as to the generality of the articles he employs in vitiating his wares; but pepper he seems to think is given up to him by the public to "cook" in any manner he thinks fit. This he almost invariably does by the addition of what is known in the trade as P. D., or pepper-dust, _alias_ the sweepings from the pepper warehouses. But there is a lower depth still: P. D. is too genuine a commodity for some markets, and it is accordingly mixed with D. P. D., or dirt of pepper-dust. A little book, published not long since, entitled "The Successful Merchant," which gives the minute trade history of a gentleman very much respected in Bristol, Samuel Budgett, Esq., affords us a passage bearing upon this P. D. which is worthy of notice.