The Power That Preserves | My Web Site Page 073 Chapter 01 Page 02

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The rougher the method of assay adopted, the larger should be the quantity of ore taken. If the degree of accuracy attainable with the methods and instruments at the assayer's service is known, it is easy to calculate what quantity should be taken for any particular case. If the results are good within 0.001 gram, then, taking 1 gram of ore we can report within 0.1 per cent., or if they are good within 0.0002 gram, taking 20 grams of ore, we can report within 1 part per 100,000, or very closely within 6-1/2 dwt. to the ton. If it is wished to be yet more particular in reporting, larger quantities must be taken. The difficulty of manipulating very small or very large precipitates, &c., must be borne in mind. So, too, must the fact that the greater the weight of the final product of an assay, the less, as a rule, is the percentage error. The distinction between absolute and percentage error, often overlooked, is important. If 0.5 gram of silver be cupelled with 20 grams of lead, there may be obtained a button of 0.495 gram; the absolute loss is 0.005 gram, and this equals 1 per cent. of the silver present. Similarly, cupelling 0.1 gram, the resulting button may be 0.098; the absolute loss is only 0.002 gram, but this equals 2 per cent. of the silver present. In the same way the student should see that the two results, 91.5 per cent. and 92.0 per cent., are really more concordant than the results 9.1 per cent. and 9.2 per cent.

The phaeton was driven onwards with the last words, leaving Mrs. Fitchett laughing and shaking her head slowly, with an interjectional "Sure_ly_, sure_ly_!"--from which it might be inferred that she would have found the country-side somewhat duller if the Rector's lady had been less free-spoken and less of a skinflint. Indeed, both the farmers and laborers in the parishes of Freshitt and Tipton would have felt a sad lack of conversation but for the stories about what Mrs. Cadwallader said and did: a lady of immeasurably high birth, descended, as it were, from unknown earls, dim as the crowd of heroic shades--who pleaded poverty, pared down prices, and cut jokes in the most companionable manner, though with a turn of tongue that let you know who she was. Such a lady gave a neighborliness to both rank and religion, and mitigated the bitterness of uncommuted tithe. A much more exemplary character with an infusion of sour dignity would not have furthered their comprehension of the Thirty-nine Articles, and would have been less socially uniting.

The principle of association, as every one knows, involves that whenever two things have been associated sufficiently together, the suggestion of one of them to the mind shall immediately raise a suggestion of the other. It is in virtue of this principle that language, as we so call it, exists at all, for the essence of language consists, as I have said perhaps already too often, in the fixity with which certain ideas are invariably connected with certain symbols. But this being so, it is hard to see how we can deny that the lower animals possess the germs of a highly rude and unspecialised, but still true language, unless we also deny that they have any ideas at all; and this I gather is what Professor Max Muller in a quiet way rather wishes to do. Thus he says, "It is easy enough to show that animals communicate, but this is a fact which has never been doubted. Dogs who growl and bark leave no doubt in the minds of other dogs or cats, or even of man, of what they mean, but growling and barking are not language, nor do they even contain the elements of language."

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