sudden change of temperature when the body is warm and not in action.

35. The air passing through the nose brings the odoriferous particles of bodies into contact with the olfactory nerves, the nerves transmit the impression to the brain, by means of which it is perceived by the mind.

36. The sense of touch resides more particularly in the papillæ of the skin; most numerous on the inner side of the fingers.

37. The pads of the spine become condensed by the weight they bear during the day; their elasticity causes them to resume their usual size during the night.

38. They are incisors, canine, bicuspids and grinders or molars.

39. The larynx grows larger and the cords longer and coarser, making the voice deeper.

40. Blood from an artery will be red and come in jets; from the veins dark and with a steady stream.

41. A thin, colorless, slightly alkaline liquid secreted by the mucous membrane lining the mouth, and the three pair of salivary glands in the neck.

42. A thin colorless fluid, secreted by the stomach to the amount of twelve pounds per day.

43. It diminishes the mental force, dissipates the energies, and palsies the strength. This is more noticeable in those of a nervous temperament. 44. It is nearly the shape of an egg, surrounded by a double membrane; within this is a fine tissue with blood-vessels which convey one-fifth of the whole circulation of the body.

45. It is the least solid organ in the body. Although the seat of sensation, it is itself without feeling, and may be severed or burned without producing pain.

46. The brain, the spinal cord, and the nerves.

47. Because it supplies more carbon, giving more heat.

48. William Harvey, English, about 1616.

49. A violent expiration, in which the air is driven through the mouth50. A violent expiration, the air being forced through the nose.

51. In snoring the air passes through both nose and mouth. Sound is produced by the palate flapping in this divided current of air, throwing it into vibrations.

52. Laughing and crying are similar; the expressions of the face distinguish between them; short and rapid contractions of the diaphragm make the sound.

53. It is caused by a convulsive catch of some respiratory muscles, accompanied with a closure of the glottis, producing a sudden sound. 54. The heart, arteries, veins and capillaries.

55. Yes; except the cuticle or outer skin, nails, hair, etc.

56. About eighteen pounds, although there is much variation.

57. It is purified in the lungs, by the oxygen of the air we breathe. 58. In about twenty-three seconds.

59. In from one to two minutes.

60. The capillaries are the minute terminal branches of the arteries, and pervade nearly every tissue of the body, in a vast network.

61. The temperature of the body is not far from 98°.

62. Its protective power; its exhaling power, and its absorbing power. 63. Over two million. Equal to a continuous tube of two and a half miles.