vi CONTENTS. 
SECTION PAGE 
35. Draw-tube, 21 
36. Names applied to Object-Glasses, 21 
37. Foci of Higher Powers inconveniently near to Objective, 22 
CHAPTEE IL 
MECHANICAL POETION OF THE MICROSCOPE. 
38. Modern Improvements, 23 
39. Base, 23 
40. Arrangement for Inclining the Instrument, 23 
41. Stage, 24 
42. Adjustment of Focus, 24 
43. Simplicity and Facility of Adjustment, 24 
44. Description of Microscope Stands, 24 
45. No. 1, Educational Microscope, 25 
46. No. 2, Student’s Microscope, 27 
47. No. 3, Student’s Microscope, 28 
48. No, 4, Student’s Larger Microscope, 29 
49. Stage movable by Back and Screw, 30 
50. No, 5, Another form of Student’s Microscope, 31 
51. Chevalier’s Prismatic Body, 32 
52. Prof, Bailey’s Indicator Stage, 33 
53. No, 6, Portable Microscope, 35 
54. No. 7, Large Microscope, 37 
55. Chemical or Inverted Microscopes, 38 
56. No. 8, Simple form of Inverted Microscope, 39 
57. More complete Inverted Microscope, 40 
58. Obiect-<Glasses, 40 
59. Rules for Adjusting Object-Glasses, 42 
60. Delicacy of Adjustment for Thin Covers, 42 
61. Second Class Objectives, 43 
CHAPTEE III. 
ACCESSORY APPARATUS. 
62. Micrometers, 46 
63. Glass Stage Micrometers Mounted in Brass, 46 
64. The Cobweb Micrometer, 45 
65. Ross’ Eye-piece Micrometer, 47 
66. Jackson’s Micrometer, 47 
67. Comparative Merits of Micrometers, 48 
