XX TABLE OF CONTEXTS. 



PRINCIPLES OF AGRICULTURAL CHEMISTRY— 



into stimulant, and nutritive manures ; examples of the benefit derived 

 from mechanical manures, p. 222-3 ; washing may sometimes be 

 turned to good account ; chemical manures specially considered ; 

 " humus" ; its mode of action ; its properties, p. 224; clays to some 

 extent a substitute for humus ; green cropping — rationale of; ammon- 

 iaral manures; ammonia required for the nutrition of plants, p. 225 ; 

 also a stimulant ; relation of leaves to ammonia ; Peruvian Guano, 

 22G ; when is manure most profitable ? Columbian Guano ; Super- 

 phosphate of Lime ; effects of its use, 227 ; Chilian Saltpetre ; 

 Common Salt ; Gypsum ; Quicklime and Carbonate of Lime, 228 ; 

 action of lime, its beneficial effects detailed, 228-230 ; difference be- 

 tween lime and marls, different condition of ingredients in soils and 

 marls, 231 ; effect of marls transient, why, cases, 231 ; classification 

 of marls ; I. Cretaceous Marls include, Greenland Marls, Clay 

 Mails, Greenish Sands. II. Marine Tertiary Makes. III. Clay 

 Marls OF the Upper Fbesh Water Tertiary. IV. Fresh Water 

 Marls later than Tertiary, 231-233; marling, directions as to, 

 ovt i drainage, Mr. Ruffin's Treatise referred to and recommended, 

 234 ; effects of mailing on health, gypseous mails, stable manure, its 

 great value, composting, 235-23G, comparative value of fresh and 

 rotten manure discussed, method of culture, robbing the soil, 238 ; 

 imminence of exhaustion, exhaustive culture irrational, 239 ; culture 

 of too much land, restoration of exhausted sods, rotation of crops, 240; 

 is only a systematic modo of exhausting the soil, order of rotation in 

 southern crops not yet determined, rotation valuable in manured lands, 

 241 ; rule for pre: fertility of a soil — return to it so far as 



practicable everything taken from it; cotton one o( the least exhausting 

 of crops, value of cotton seed as a manure, 242; best method of ap- 

 plying it, ils mode of operation, 243 ; improvidence of using cotton 

 seed as (bod, manufacture of cotton seed oil improvident, unless tho 

 cake and hull be returned to the soil, selling cotton seed is really 

 selling manure, 244; waste of cotton seed in the Mississippi Bottom, 

 245 ; Subsoilmg < • entially of two processes, deep plowing 



tempers extremes of wet and drouth, but turning up the subsoil to 

 the sm face is not always desirable, under what circumstances it is 

 desirable shown, cases illustrating the pi inciples laid down, 245, G, 7, 8 ; 

 Tullian or Lois Weedon system denounced, drainage, 249 ; dung — 

 producing system of culture shown to be fallacious, 250, 1 ; what 

 becomes of the lost fertility of soils ? how can a maximum of fertility 

 be perpetually maintained ? 25J, 2. 

 SPECIAL PART— AGRICULTURAL FEATURES OF THE STATE OF 

 MISSISSIPPI; THE NORTH-EASTERN PRAIRIE REGION : its limits, 

 not implied that the while district is prairie in its character, is char- 

 acterized and determined by the cretaceous strata, 254; Tishomingo 

 and Itawamba, lands of P> : g Pear, and Yellow Creeks, 255 ; character- 

 istic growth, 25G ; soils of E. Monroe and the valley of the Tombigbee ; 

 peculiar growth, 257 ; hommoek of the Tombigbee, its vegetation, 

 " white lime country " of Tishomingo and Itawamba, 258 ; "Mahog- 

 any Soils", "Beeswax Hommoek", Black Prairie Soil, soils near 

 Farming ton, 259 ; Corinth, Planville, Hatchie, Tuscumbia and Rich- 

 mond, their soils and vegetation, 2u'0 ; the prairie region proper, soils 

 and peculiar growth, 2G1 ; Monroe prairie soil, Monroe prairie under- 

 subsoil, 2G2 ; analysis of latter ; relations of soil and subsoil, of theso 

 prairies, defects and remedies of, 263 ; advantage of deep plowing and 

 drainage ; bald prairies require vegetable matter ; prairie uplands of 

 Kemper and Noxubee, 264 ; their crops and natural growth ; lands of. 



