X ANALYSIS OF THE LESSONS. 



LESSON XXI. THE SEED p. 134. 



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

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

 nel or Nucleus. 373. The Albumen. 374, 375. The Embryo. 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 XXII. How PLANTS GROW 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 Structure illustrated : 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 ; the 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 FABRIC : 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. ANATOMY OF THE ROOT, STEM, AND LEAVES, p. 149. 



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

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

 stem. 422. The two sorts of stem. 423. The Endogenous. 423. The Exo- 

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

 itself. 427. Parts of the bark. 428. Growth of the exogenous stem year afte 

 year. 429. Growth of the bark, and what becomes of the older parts. 431. 

 Changes in the wood ; Sap-wood. 432. Heart-wood. 433. This no longer liv- 



