Urine as a fertilizer

1278. Amongst excrementitious animal substances used as manures, urine is the one upon which the greatest number of chemical experiments have been made, and the nature of which is best understood. The urine of the cow contains, according to the experiments of Brande: water 65; phosphate of lime 3; muriates of potassa and ammonia 15; sulphate of potassa 6; carbonates, potassa, and ammonia 4; urea 4.