x' ANALYSIS OF THE LESSONS. 



LESSON XXI. The Seed P- 13*- 



366. The Seed ; its origm. 367. Its parts. 360, 369. Its coats. 370. The 

 Ai-il or Arillus. 371. Names applied to the parts of the seed. 372. The Ker- 

 nel or Nucleus. ,373. The Albumen. 374, 375. The Embiyo. 376. The 

 . Radicle: 377. The Cotyledons or Seed-leaves : the monocotyledonous, dicoty- 

 ledonous, and polycotyledonous embryo. 378. The Plumule. 379. The circle 

 of vegetable life completed. 



LESSON XXIL How PiANis gkotv p. 138. 



380, 381. Growth, what it is. 382. For the first formation or beginning of 

 a plant dates farther back than to, 383. the embryo in the ripe seed, which is 

 already a plantlet. 384. The formation and the growth of the embryo itself. 

 385. Action of the pollen on the stigma, and the result. 386. The Embryonal 

 Vesicle, or first cell of the embryo. 387. Its growth and development into the 

 embryo. 388. Growth of the plantlet from the seed. 389. The plant built up 

 of a vast number of cells. 390. Growth consists of the increase in size of cells, 

 and their multiplication in number. 



LESSON XXIII. Vegetable Fabric : Cellular Tissue. . . p. 142. 



391, 392. Organic Stnicture illusti'ated : Cells the units or elements of plants. 

 393. Cellular Tissue. 394, 395, 397. How the cells are put together. 396. Inter- 

 cellular spaces, air-passages. 398 Size of cells. 399. Rapidity of their produc- 

 tion. 400. Their walls colorless ; tshe colors owing to their contents. 401. The 

 walls sometimes thickened. 402. Cells are closed and whole ; yet sap flows from 

 one cell to another. 403. Their varied shapes. 



LESSON XXIV. Vegetable Fabeic : Wood p. 145. 



404. All plants at the beginning formed of cellular tissue only ; and some 

 never have anything else in their composition. 405. Wood soon appears in 

 most plants. 406. Its nature. 408. Wood-cells or Woody Fibre. 409. Hard 

 wood and soft wood. 410. Wood-cells closed and whole ; yet they convey sap. 

 411. They communicate through thin places : Pine-wood, &c. 412. Bast-cells 

 or fibres of the bark. 413. Ducts or Vessels. 414. The principal kinds. 415. 

 Milk-vessels, Oil-receptacles, &c. 



LESSON XXV. Akatomt of the Root, Stem, akd Leaves, p. 149. 



416. The materials of the vegetable fabric, how put together. 417-419. 

 Stnicture and action of the rootlets. 420. Root-hairs. 421. Structure of ths 

 stem. 422. The two sorts of stem. 423. The Endogenous. 423. The E.xo- 

 genoHS : 425. more particularly explained. 426. Parts of the wood or stem 

 itst'lf. 427. Parts of the l)ark. 428. Growth of the exogenous stem year aftet 

 year. 420. Growth of the hark, and what becomes of the older parts. 431. 

 Changes in the wood; Sap-wodd. 4-32. Hoart-wnnd. 4.13. This no lono-or liv- 



