QUESTIONS. 283 



Organic manures divided ? The principal vegetable ? 362. Green 

 manures? What plants are best for the purpose? 3G3. For sandy 

 soils? clayey ? calcareous ? 364. For what districts ? 365. Green 

 crops for winter grain to be treated ? 366. How weedy land to be ? 

 367. Farther advantages of green manures ? 368. Value of sea ma 

 nures ? Value of eel-grass ? Management of sea manures ? For 

 what crops valuable ? 369. What best for each vegetable ? Effects of 

 straw ? Stubble to be managed ? Good for hay land ? 370. Said of 

 leaves ? Of different kinds ? 371. Why are animal manures valuable? 

 How do they act? 372. Flesh contain? How to be applied ? 373. 

 Best to do with a carcass ? How valuable ? 374. Sulphuretted hydro 

 gen ? How does it act ? 375. Rank is to be given to hair, &c. ? Why ? 

 376. Effect of hair ? State the loss from its being thrown away. 377. 

 Value of blood as manure ? How to be managed ? 378. Of bones ? 

 How prepared and applied? 379. Action be accelerated? 380. 

 Whence the value of animal manures ? 381. Best of manures ? Why ? 

 Value of milk ? Different kinds ? 382. Why is particular care to be 

 taken of manure ? To be saved? The dangers of loss ? 383. Loss 

 be prevented ? 384. Decomposition ? Cause ? Vital principle act ? 

 385. Brings on vinous fermentation ? Its products ? How is vinegar 

 made? 386. Final products of decay? Essential to it? Prevents it? 

 387. The stable to be kept sweet ? Cost ? 388. Different value of 

 different manures? Should all be thrown together? 390. Liquid 

 manure formed? For what fields to be used? 391. Best of all? 

 392. Says chemical analysis ? How lost ? Consequences ? 393-394. 

 Prevent disagreeable effects ? 395. Guano ? Where found ? Consist 

 of? 396. Experiment. Another. 397. Another. Common fear? 

 Well founded ? 398. Where may plants get their mineral elements ? 

 Evidence ? 399. Those eight? Still more essential ? 400-401. How 

 valuable is muck ? Substitutes ? From ponds and pools ? How save 

 the scourings of hills ? 402. Good compost for trees ? Clayey soil ? 

 Common crop ? Another ? How is health affected by the management 

 of manure ? Effect of these gases on health? Give instances. Of 

 carbonic acid ? 404. In small quantities ? Effects in the school room ? 

 Of ammonia ? 405. Where are they generated ? How show them 

 selves ? Who are particularly subject to fever and other disease ? 

 406. How may the well be affected ? Consequence ? Preventive ? 



CHAPTER XIII. 407. When is draining indispensable ? The other 



essential operations ? Ploughing? 408. Objects of ploughing ? How. 



can most of these be done most effectually ? 410. Advantages of deep 



ploughing? Effects of deep ploughing upon the roots ? 411. Saving 



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