VllI ILLUSTRATIVE WOOD-CUTS. 



13. Position of the ribs, 233. 



14. Illustration of the hydrostatic paradox, 243. 



15. The principle illustrated by the blow-pipe, 245. 



16. Windpipe of the crane, 249. 



17. Air/-cells in the bird^ 251. 



18. Mechanism of th6 egg, 255. 



19. Tooth of the tiger, 258. 



20. Skull of the boaver, 260. 



21. Molar tooth of the horse, 263. 



22. Lower jaw of the tiger, 267. 



23. Refraction of light, 295. 



24. Reflection and refraction, 296. 



25. Refraction of light, 298. 



26. Refraction of light in the eye, 303. 



27. Refraction of hght through the eye, 304. 



28. Muscles of the eyehd, 323. 



29. Auditory apparatus of the cuttle-fish, 331. 



30. Direction of fluids through tubes, 345. 



31. Junctions of the veins and arteries, 347. 



32. Effects of fluids passing through tubes, 248. 



33. Forcing pump, 354. 



34. Works of a watch — the wheel and axle, 374. 



35. Works of a watch — the wheel and pinion, 37 5. 



36. 7, 8. Works of a watch — the spring, barrel, and fusee, 376. 



39. Works of a watch — the scapement, 379. 



40. Works of a watch — the crutch and scapement- wheel, 380. 



41. 42. Works of a watch — the second, minute, and hour hands 



381, .382. 

 43. Works of a watch — the horizontal view of the, 384. 



