Manures for Special Crops.-- Hops.-- Indian Corn.-- Turnips.-- Mangel-Wurzel or Sugar-Beets.-- Cabbages, Parsnips, Lettuce, Onions, etc. 274 CHAPTER XXXV. Manures for Gardens and Orchards.-- Market Gardens.-- Seed-growing Farms.-- Private Gardens.-- Hot-beds.-- Manure for Nurserymen.-- Fruit Growers.-- Hen-Manure. 294 CHAPTER XXXVI. Different Kinds of Manures.-- Cow Manure.-- Sheep Manure.-- Buying Manure.-- Liquid Manure.-- Nightsoil and Sewage.-- Peruvian Guano.-- Salts of Ammonia and Nitrate of Soda. 302 CHAPTER XXXVII. Bone-Dust and Superphosphate of Lime.-- Bone furnishes Nitrogen as well as Phosphate of Lime.-- Increasing the Availability of Bone with Sulphuric Acid. 314 CHAPTER XXXVIII. Special Manures.-- Liebig’s Views.-- Special Manure for Wheat and Turnips.-- Rothamsted Experiments. 320 CHAPTER XXXIX. Value of Fertilizers.-- Cost per pound of the Essential Constituents of Fertilizers.-- Value of Guanos.-- Potash as a Manure. 324 CHAPTER XL. Restoring Fertility to the Soil, a Chapter by Sir John Bennet Lawes.-- The Treatment of a Poor Farm, to Restore it most Profitably.-- Meat-making the Back-bone of the System.-- The Use of Sheep to Manure the Soil.-- The Feeding of Cotton-seed Cake.-- Artificial Manures not Profitable on Poor Land.-- The Loss of Nitrogen.-- The Formation of Nitric Acid. 342 APPENDIX. Letter from Edward Jessop.-- From Dr. E. L. Sturtevant.-- From M. C. Weld.-- From Peter Henderson.-- From J. B. M. anderson.-- Manure Statistics of Long Island.-- Letter from J. H. Rushmore.-- Letter from John E. Backus.-- Manure in Philadelphia.-- Various other Letters. 352 INTRODUCTION TO NEW AND ENLARGED EDITION. Sir John Bennet Lawes kindly consented to write a Chapter for the new edition of this work. The Deacon, the Doctor, the Squire, Charlie and myself all felt flattered and somewhat bashful at finding ourselves in such distinguished company. I need not say that this new Chapter from the pen of the most eminent English agricultural investigator is worthy of a very careful study. I have read it again and again, and each time with great and renewed interest. I could wish there was more of it. But to the intelligent and well-informed reader this Chapter will be valued not merely for what it contains, but for what it omits. A man who knew less would write more. Sir John goes straight to the mark, and we have here his mature views on one of the most important questions in agricultural science and practice.