282 QUESTIONS. 



CHAPTER XI. 314. Double part does a soil play? Qualities do 

 different plants require ? 315. How are these evils remedied ? Amend 

 ments ? Give examples. 316. Amendments for argillaceous soils ? 

 317. For silicious soils ? Irrigation ? Its effects ? 318. Effects of 

 planting ? Draining ? 319. As to the advisableness of an amendment, 

 what question is to be settled? 320. A permanent amendment? One 

 not necessarily permanent? 



CHAPTER XII. 321. What elements must a soil contain? For 

 marine plants, what are necessary ? 322. In what state are the ele 

 ments found ? A silicate ? Sulphate ? Nitrate ? Phosphate ? Carbo 

 nate ? A sulphate of lime, &c. ? How are these known to be essential 

 to plants ? The effect if one were entirely wanting ? Give an example. 

 324. Why should the elements derived from the atmosphere be arti 

 ficially furnished ? 326. What was often said by Prof. Nuttall ? 327. 

 Describe the slow process by which wild plants are furnished with 

 humus. 328. How is forest mould formed ? When it is quite wanting 

 how is humus to be furnished ? Organic substances ? 329. How do 

 they act? 330. How do they act on each other? 331. Fertilizers 

 divided ? 332. What double character have mineral fertilizers ? 333. 

 The principal m. f. ? 334. Quicklime ? Its effects ? What state 

 should it be in ? Power has water containing CO 2 ? Act upon plants ? 

 335. Describe a Flemish compost. 336. Valuable properties in 

 lime? 337. Its effects in small quantities ? 338. To be done with 

 shells ? 339. Marl ? Its value ? 340. Plaster ? Why is it valuable ? 

 Sulphate of lime ? 341. Where is sulphur found ? Sulphuric acid ? 

 What salts does it form ? 342. Hard water ? How made soft water ? 

 343. Write upon the black-board and explain the diagram showing the 

 mutual action of sulphate of lime and carbonate of ammonia. 344. 

 Whence comes the carb. of Am. ? 345. How should plaster be 

 applied? 346. Effects of sulphate? 347. The Westphalian proverb 

 about ashes ? Ashes ? Character of these salts ? 348. Unlenched 

 ashes good for ? 349. Leached ashes ? 350. Value of coal ashes ? 

 351. Ley ? (This word, in common dictionaries, is spelled lie, in 

 books of chemistry and agriculture, Icy and lye.} Its i-fft-ets ? What 

 else? 352. Value of soot? 353. Of carbonates of potash and of 

 soda ? 354. Of salts of Am. ? 355. Of nitrates ? 356. Phosphate of 

 lime ? To what is it essential ? Value of phosphates ? 357. How an- 

 these valuable ? 358. The uses of common salt ? 359. The object of 

 manures? Of organic manures? Of humus? The last result of 

 il. c;iv of regetablea ^ 860. In what state are organic manures to be 

 employed? Why: Nature of Am. ? How can it be saved? 301. 



