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. 1880 Excerpt: ...far exceeds that." "Acidulated fish" and "fish and potash salts." 296. The "acidulated fish" (class No. 6 on page 219) is prepared by treating the fish scrap with sulphuric acid to render the phosphoric acid more soluble. Unfortunately the constitution of the tissues of the fish is such as to resist the action of the ...
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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. 1880 Excerpt: ...far exceeds that." "Acidulated fish" and "fish and potash salts." 296. The "acidulated fish" (class No. 6 on page 219) is prepared by treating the fish scrap with sulphuric acid to render the phosphoric acid more soluble. Unfortunately the constitution of the tissues of the fish is such as to resist the action of the acid, and the desired result is only partly attained. A sample examined under the writer's direction gave 7.09 per cent, of phosphoric acid, of which only 1.76 per cent. was soluble in water. It will be remembered that Pettitt's process for the manufacture of fish waste into a fertilizer was based upon treatment of the fish with acid, and did not prove a success. Various efforts in this same direction arc reported in this country and in Europe, but none, as I can learn, have been found profitable. The imperviousness of the tissues to the actiou of the acid has thus far been an insurmountable obstacle to success, and will probably remain so. The " fish and potash salts" (class No. 7, above) is a mixture, as its name represents, of fish, half-dry scrap apparently, in the specimens I have seen, with German potash salts. The idea is a sound one, in that the salts used, doubtless of the lower grades, like Leopoldshall Kainit, and containing large percentages of chloride of sodinm (common salt), wonld act as a preservative, and further, the potash supplies a lack in the fish and makes of it a " complete" fertilizer. The amounts of the " acidulated " fish and "fish and potash salts " in the market are so small as to give them very little importance. Manufacture of "ammoniated superphosphates." 297. The most important use of fish waste is in the manufacture of nitrogen...
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