Agricultural Chemistry, 4 Lectures

Agricultural Chemistry, 4 Lectures

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1857 edition. Excerpt: ...guano, which in reality is nothing more or less than sea-sand, containing a certain amount of fragments of fish-bones. With respect to the second manure given in the above diagram, I would observe that a more fraudulent case, excepting the British Economical, has never been brought under my notice. Instead of 16 per cent. of ammonia, which good Peruvian guano contains, this essence has only six-tenths per cent., and instead of 20 to 25 per cent. of phosphate of lime or bone-earth, only two to threetenths per cent. The examination, indeed, has shown that this "essence of guano " contained a mere trace of Peruvian guano, a large quantity of gypsum, lime, sand, brick-dust, common salt, and sheep's dung. So clumsily was the mixture made, that the last-mentioned ingredient could be readily identified by its characteristic form. How is it, it may well be asked, that sucb and similar manures can find purchasers in an enlightened country like England? The answer to this question is to be found in the credulity of many, who, strange to say, place more reliance upon printed testimonials, than upon the only trustworthy means of ascertaining the value of manures, t. e. chemical analysis. Let me guard you against being deceived by enticing testimonials, for, generally speaking, the worse the manure the more favourable the testimonials. Gas-lime, road-scrapings, peat-ashes, and similar refuse matters, in a more or less disorganised state, can be sold, as shown by actual experience, at high prices, and the most favourable testimonials respecting their efficacy can be obtained, if an originator of a fraudulent manure makes up his mind to spend a couple of thousand pounds in advertisements, getting up testimonials, and otherwise pushing his...show more

Product details

  • Paperback | 32 pages
  • 189 x 246 x 2mm | 77g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236893875
  • 9781236893871