On Subtlety

Recognition of the best steel. original: "Chalybis" — 160
The most noble kinds of steel. — 160
How steel is made. — 159
How steel may cut iron. — 160
Why the chameleon changes color. — 239
The Chiurca animal. original: "Chiurca animal". This refers to the opossum, which Cardano described based on early reports from the Americas. — 232
Chlorogea. A type of green earth or pigment. — 138
Disputation of a Christian against a Muhammadan. see: Conflict of Laws. original: "Legum contentio"
Chrysocolla. Chrysocolla: Historically refers to various green minerals like malachite or substances like borax used for soldering gold. — 136
How chrysocolla is made. — 137
The powers of chrysolite. — 174
Chrysolite is the ancient topaz. — 175
Known chemical inventions. — 321
Chemical inventions not yet known or obsolete. — 322
What chemists original: "Chymistæ" are capable of. — 154
Glow-worms. original: "Cicendulæ" — 224
Swan. original: "Cicnus" see: Swan. original: "Olor"
Why bedbugs original: "Cimices" do not bother Carthusians. see: Carthusian monks.
Bedbugs gather at a certain kind of fat. — 348
How a half-ounce of cinnamon can suffice for a year. — 281
Cinnamon. — 199
Cinnabar or vermilion. — 141
Twelve properties of the circle. — 303
Three properties of the circle, hyperbola, and ellipse. original: "defectioni", referring to the "falling short" or ellipsis in conic sections. — 303
A property of the circle, conic sections, and opposites. — 305
Cisum. Likely a mineral or pigment mentioned in Book 5. — 136
Why citrons rot when hot bread is placed over them. — 353
City or cities. see: Town or Towns.
Cobalt. — 136
The Cocuyo. original: "Cocoyum". A bioluminescent click-beetle from the West Indies. — 224
Coccus. Likely referring to the kermes dye-insect or the coconut. see: Palm.
The Indian snail (shell). — 182
So that cooking original: "Coctio" may be completed well and quickly. r — 281
Codrus the physician. — 204
Sexual intercourse. original: "Coitus" see: Venus.
Colanus. see: Diver. original: "Vrinator". Referring to a famous diver, likely Nicolas the Fish (Cola Pesce).
A diamond collar. — 355
Why the skin of the neck is more durable. see: Skin of the neck.
For one suffering from colic, the intestines, dung, and skin of a wolf are helpful. — 346
A protection so that the colon is not infested with pains. — 348
The color of hooves, horns, claws, and beaks is similar to the color of the skin. see: Skin color.
Incorruptible color from lapis lazuli. — 138
Why the color green is not found in animals. see: Animals.
No colored thing is intensely transparent. — 149
With what things colors may be restored. — 330
All colors consist of three elements. — 167
Colors which necessarily have much light. — 167
Colors of stones. see: Colors of stones.
Seven kinds of colors. see: Flavors.
The distinction of colors by species from light. — 167
The names of colors are all taken from things. — 317 & 318
The order of matching colors. — 110
From where the orderly variety of colors proceeds. — 369
Protection for doves: a wolf's head hung in the dove-cote. — 346
How doves may be attracted. — 354
The omens of comets. — 97
A comet is not formed in the region of the elements. i.e., the sublunary sphere; Cardano argues they are celestial. — 96
How long a comet lasts. — 97
What a comet is. — 97
Three things common to all comets. — 96
For the falling sickness original: "Comitiali morbo". Epilepsy, so called because a seizure was an omen to dissolve a Roman assembly (comitia). an incantation. see: Incantation.
Composite natural bodies of eleven kinds. — 117
Why shellfish are hard. see: Why seaweed is soft.
The cause of variety in the colors of shellfish. — 237
The Conchite stone. A stone containing or shaped like a shell; a fossil. — 192
What digestion original: "Concoctio" does. — 266
How preserves original: "Condita" are made. — 287
Three properties of the right cone. — 307
Two properties of rectangular conoids. Paraboloids of revolution. — 307
A property of obtuse-angled conoids. Hyperboloids of revolution. — 307
How woven things original: "Contexta" are distinguished. — 330
The privilege of opposites. Likely referring to opposite sections of a hyperbola. — 305
A method of cooking with a moderate fire. — 322
The powers of coral. — 178