Nitrogen in manure 414 lbs. = Ammonia £. _s._ _d._ 494 lbs., at 6_d._, 12 7 0 Phosphoric acid 393 lbs., at 1¹⁄₂_d._ per lb., 2 9 1 Potash 585 lbs., at 3_d._ per lb., 7 6 3 ------------- 22 2 4 --------------- £168 11 0 Manure per cow per day 88 lbs., per week 616 lbs. _s._ _d._ Containing ammonia 3 lbs., 1 6 Phosphoric acid 2.40 lbs., 0 3¹⁄₂ Potash 3.57 lbs., 0 10¹⁄₂ ------------ Value of a cow’s excrement, per week, 2 8 The analyses of the chief ingredients of my own produce, or such extra materials as I usually purchase, have been made by Professor Way; for other materials I have had recourse to a very useful compilation by Mr. Hemming (vol. xiii., p. 449, of the Society’s Journal), and to Morton’s “Cyclopædia of Agriculture.” The analysis of straw is that of oat-straw; that of green food is derived from the analysis of rape-plant, cabbages, and kohl rabi. During February and March I have been using wheat and barley straw with marigold, and, as these materials contain less oil, I give in the steamed food three ounces of linseed-oil per day to each animal. For the composition of milk I adopt that by Haidlen, whose method of analysis is reputed to be the most accurate, the proportion of butter in my milk being this season very similar to that given by him. It will be observed that this is the gross return for twenty-seven and one third weeks from the time of calving, from which will have to be deducted expense of attendance, etc. £. _s._ _d._ The materials used for food are found to have cost 70 0 9 The value of these materials as manure consists of 888 lbs. nitrogen = 1061 lbs. ammonia, at 6_d._, 26 10 6 Phosphoric acid and potash, 9 15 4 -------------- Value of food if employed as manure, £36 5 10