This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1821 edition. Excerpt: ...upon the proportion of which the value of the stone must depend. One thing appears to be generally admitted, that the soil may receive with it imperishable and fertilizing additions. Most, if not all the farmers, who are in the habit of using plaster, of whom we made enquiry concerning its properties, ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1821 edition. Excerpt: ...upon the proportion of which the value of the stone must depend. One thing appears to be generally admitted, that the soil may receive with it imperishable and fertilizing additions. Most, if not all the farmers, who are in the habit of using plaster, of whom we made enquiry concerning its properties, entertained the opinion that it either attracted moisture, or that land sown with it retained the moisture longer than that without it. "For instance," say they, "dew will lay an hour longer upon plastered than upon unplastered land."--This observation is corroborated by the fact, that it is a property of sulphuric acid, which is one ingredient in the plaster stone, to attract-water from the atmosphere.-Some writers, from an observation of the benefit of common salt and other minerals in the animal economy, have considered the operation of salt upon vegetables as analogous; and, accordingly, have classed it as a stimulant. But the following objections, started by Mr. David Thomas, of Aurora, to whom I am indebted for much information on this, as well as many other subjects, demand some attention. 1st. On some soils, where the vegetable matter has been reduced and the land mellowed by frequent ploughings, not the smallest benefit from this manure has been perceived; But on restoring the vegetable matter, the effect of gypsum is striking. 2nd. On the same soil, from which gypsum produces a luxuriant vegetation, simple culture has an effect similar and not less remarkable. 3rd. The same result is also produced by rain water in small and frequent applications. 4th. Animal substances. It would be desirable to know, why in all these cases, that mineral is not equally necessary. Or, if it be, whence and in what manner is the supply obtained. AroN.--This...
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Add this copy of Travels in the United States of America, and Part of to cart. $59.74, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2015 by Palala Press.
