CONTENTS. 
MICROSCOPIC DRAWING- AND ENGRAVING. 
Chap. I.—1. Beautiful precision of 
the minute structure of natural 
objects.—2. Cornea of a fly’s eye.— 
3. Number of eyes of different in¬ 
sects.—4. Astonishing precision of 
artificial objects.—5. Demand for 
such objects by Mieroscopists.—6. 
Classes of such artificial objects.— 
7. Microscopic scales.—8. Method 
of engraving them.—9. Measure¬ 
ment of microscopic objects with 
them. — 10. Their minuteness. —11. 
Scales of Mr. Froment.—12. Rect¬ 
angular scales.—13. Micrometric 
threads.—14. Necessity for micro¬ 
scopic tests.—15. Test-objects.— 
16. Telescopic tests ; double stars. 
—17. Nebulas and stellar-clusters. 
—18. Effects of different telescopes 
upon them : telescopes of Herschel 
and Lord Rosse.—19. Remarkable 
nebulas described by Herschel.—20. 
Different 1 y seen by Lord Rosse.— 
21. Microscopic tests.—22. Im¬ 
proved powers of microscope.—23. 
The Lepisma-Saccharina.—24. The 
Podura, or Spring-tail. 
Chap. II. — 25. Natural tests not in¬ 
variable.—26. Natural tests im¬ 
perfect standards.—27. Nobert’s 
test-plates. — 28. The degree of 
closeness of their lines.—29. Their 
use.—30. Apparent error respecting 
them.—31. Froment’s microscopic 
engraving.—32. Method of executing 
it.—33. Various methods of micro¬ 
scopic drawing. — 34. Drawings by 
squares.—35. Dr. Goring’s drawings. 
—36. Structure and metamorphosis 
of insects.—37. The day-fly.—38. 
The larva of this insect.—39. Its 
organs of respiration.—40. Its gene¬ 
ral structure.—41. Its mobility.— 
42. State of chrysalis.—43. The 
perfect insect.—44. The production 
and deposition of its eggs, and its 
death.—45. Death may be delayed 
by postponing the laying of the eggs. 
— 46. They take no food.—47. Their 
countless numbers; their bodies 
used as manure. 
Chap. III.—48. The beetle.—49. Its 
larva.— 50. Drawing of it in its 
natural size. — 51. Dr. Goring’s 
magnified drawing.—52. Production 
of the beetle from the egg. — 53. The 
young larva.—54. Its voracity and 
manner of seizing its prey.—55. 
Description of its organs.—56. Its 
chrysalis.—57. Water-beetle.—58. 
Gnat.—59. Dr. Goring’s method of 
drawing.—60. Drawing by the ca- 
mera-lucida. — 61. Section of the 
human skin ; sweating-gland and 
duct.—62. The itch insect.— 63. 
Method of obtaining it. 
Chap. IV.—64. Structure of the itch 
insect.—65. Its habits.—66. The 
mange insect.— 67. Its form and 
structure.—68. Defects incidental 
to drawing with the camera.—69. 
Microscopic photographs.—70. Mi¬ 
croscopic daguerreotypes by Messrs. 
Donne and Foucault.—71. Descrip¬ 
tion of the blood.— 72. Red ana 
white corpuscles.—73. Daguerreo¬ 
type of a drop of blood magnified.— 
74. Magnitude of the corpuscles.— 
75. Cause of the redness of blood.—- 
76. Corpuscles of inferior animals. 
—77. White globules.—78. White 
grains. — 79. White globules con¬ 
verted into red corpuscles.— 80. 
Red corpuscles dissolved.—81. Cir¬ 
culation of the blood,—82. Method 
of showing it in the tongue of a frog. 
— 83. The arteries distinguishable 
from the veins.—84. The vascular 
system of the tongue.—85. Mucous 
glands.—86. Milk; its constitution. 
—87. Magnified view of a drop of 
milk.—88. The butter globules.— 
89. Their number variable.—90. 
Analysis of the milk of different 
animals.—91. Richness of woman’s 
milk.—92. Analogy of milk to 
blood.—93. Importance of the qua¬ 
lity of milk.—94. Its richness as¬ 
certained.—95. Quevenne’s hydro¬ 
meter applied to milk.—96. Its 
fallacy.—97. Donne’s laetoscope.— 
98. Objections to it answered.—99. 
Frauds practised by milk vendors. 
—100. Fore-milk and after-milk.— 
101. Self-engraved photographic 
pictures. 
