CONTENTS. 
the object revolve.—39. Object to 
be successively viewed by increasing 
powers.—40. Slides to be cleaned. 
—41. Compressor.—42. Apparatus 
for applying voltaic current. Tee 
ILLUMINATION OF OBJECTS I 48. 
Curious effects of light on objects.— 
44. Illumination by transmission 
and reflection.—45. Microscopic ob¬ 
jects generally translucent, or may 
be made so.—46. Effects of varying 
thickness.—47. Varying effects of 
light and shade.—48. Uses of the 
Lieberkuhn.—49. Effects of diffrac¬ 
tion and interference.—50. Use of 
daylight.—51. Artificial light.— 
52. Protection of the eye.—53. 
Pritchard’s analysis of the effects of 
illumination. 
Chap. IV. — Pritchard’s analysis of the 
effects of illumination (continued). 
Measurement of objects : 54. 
Measurement distinct from magni¬ 
fying power.—55. Measurement by 
comparison with a known object.— 
56. Micrometric scales.—57. Thin 
glass plates.—58. Micrometers.— 
59. Le Baillifs micrometer.—60. 
. Jackson’s micrometer.—61. Mea¬ 
surement by the camera lucida.— 
62. Goniometers. Magnifying 
Power : 63. This term much mis¬ 
understood. — 64. Its exact meaning. 
—65. Least distance of distinct 
vision.—66. Visual estimate of 
angular magnitude.—67. Method of 
determining magnifying power by 
the camera lucida.—68. Dimen¬ 
sions of the least object which a 
given power can render visible. 
eiap. V. — Micropolariscope : 69. 
Polarisation.—70. Condition of a 
polarised ray.—71. Polarisation by 
double refracting crystals.—72. 
Their effect upon rays of light.—73. 
The micropolariscope. The mount¬ 
ing of microscopes : 74. Conditions 
of efficient mounting.—75. Frauen- 
hoffer’s mounting.—76. Methods of 
varying the direction of the body. 
Chevalier’s universal microscope: 
77. Mounting of this instrument.— 
78. Method of rendering it vertical. 
—79. Method of adapting it to the 
view of chemical phenomena.—80. 
Method of condensing the light upon 
the object. Foss’s improved mi¬ 
croscope : 81. Useful labours of 
Mr. Foss.—82. Details of his im¬ 
proved microscope. 
hap. VI.—83. His object-glasses. 
Messrs. Smith and Beck’s micro¬ 
scope : 84. Their largest and most 
efficient instrument. — 85. Their 
smaller microscope.—86. Their ob¬ 
ject-glasses.—87. Varley’s micro¬ 
scope. M. Nachet’s microscope : 
88. Their adaptation to medical and 
chemical purposes.—89. Multiple 
microscopes.—90. Double micro¬ 
scope.—91. Binocular microscope.— 
92. Triple and quadruple microscopes 
MICFOSCOPIC OBJECTS. 
1. Microscopic objects.—2. The dragon¬ 
fly and its larvae.—3. The satyr.— 
4. The linceus sphericus.—5. The 
lurco, or glutton.—6. The water-fly. 
SOLAF MICFOSCOPE. 
i. Its utility.—2. The principle of its 
performance.—3. Why the magic 
lantern does not serve the same pur¬ 
poses.—4. The illuminating appa¬ 
ratus.—5. How to protect the 
object from heat.—6. The ampli¬ 
fying apparatus.—7. The adjust¬ 
ments.—8. The screen.—9. The 
reflector.—10. Method of mounting 
the instrument. —11. Arrangements 
for the room of exhibition.—12. 
Preliminary adjustments.—13. The 
oxy-hydrogen and electric micro¬ 
scopes. 
