On Subtlety

Water, by what means it pushes itself upward. — 16
Water in a pipe. see Bucket.
Water in crystal. see Crystal.
Water removes the force of engines. see Naval pilots. The Latin "tormentorum" often refers to siege engines or cannons; Cardano likely discusses how water or moisture affects the gunpowder or mechanics used by sailors.
Water, the method of channeling. — 12
Water drops in corrupt air turn into toads. — 353 This reflects the early modern belief in "spontaneous generation," where living creatures were thought to arise from inanimate matter.
Water nourishes few poisonous animals. see Serpents, few in water.
Water and wine, how they may be cooled. — 287
Water and wine, comparison of. see Wine.
Water and oil, comparison of. see Oil.
Waters making a very great noise. — 83
Water, the cause of its noise. — 83
Waters, why they boil. see Springs.
Water streams, why they are crooked. — 118
Water, causes of its foulness. — 75
Water, why it moves toward the south. — 75
Water, method for searching for it in dry places. — 81
Water conduits, of what materials they are made. — 181
Water machine. see Machine.
Burning water [alcohol] burns while the linen cloth remains unharmed. — 38 original: "Aqua ardens". This refers to high-proof distilled spirits, which can be lit on fire; the evaporation of the alcohol can sometimes prevent the underlying cloth from burning.
Burning water, without harming the hand. — 38
Water of separation. — 45 original: "Aqua separationis". This is nitric acid, used by metallurgists to separate gold from silver.
Most powerful water. — 45 likely referring to "Aqua regia," a mixture of nitric and hydrochloric acids capable of dissolving gold.
Sharp water. see Vinegar, how it may be turned into water.
Water that can break the stone of the bladder. — 45
Water that extends life for many centuries. — 43
Waters, a comparison of burning water and the water of separation. — 45
Distilled waters, whether they have any powers. — 43
Scented waters, how they are made. — 205
Waters dripping with oil. see Springs.
Oat water. see Intoxicating drink.
Distilled water of milk. see Milk water.
Water shining in the dark. — 224
Sulfurous waters admit fish. see Fish in hot and sulfurous waters.
Eagle. — 241
Spider, a harmful kind. see Tarantula.

Tree, naturally straight. see Fir tree.
Trees perish from quicksilver. see Quicksilver. original: "Argentum uiuum" (living silver). Quicksilver is an old name for mercury.
Trees are generally of a thinner substance than herbs. — 197
Trees, the most fruitful. — 212
Trees, why they do not have leaves as broad as herbs. — 211
Trees of the herb kind. — 213
Trees, why they live longer than animals. see Plants, why.
Trees grafted into themselves are changed. — 384
Trees that allow all others to be grafted onto them. see Grafted trees.
Trees, why the leaves fall. — 203
Trees, the reason for their thinness. — 196
Trees, differences according to regions. — 201
Trees, incredible size of. — 211
Trees, lifespans of. — 211
Trees, where they do not send roots deep into the earth, signify men who are unfaithful and inconstant. — 211 Cardano often draws parallels between the natural world and human character (physiognomy/symbolism).
Trees, use of their parts. — 215
Trees, grafting of. see Grafting method.
Trees, four differences of transplanted ones. see Plants.
Trees, the temperament [mixture of qualities] of their parts. — 215
Archimedes, praise of. — 313 Archimedes was a Greek mathematician and engineer famous for his inventions and the principle of buoyancy.
Archytas, praise of. — 314 Archytas of Tarentum was an ancient Greek philosopher and engineer, credited with building the first flying machine (a wooden pigeon).
Sand, kinds of. — 73
Silver mines. see Mines.
Silver, the nature of. — 154
Silver, its fourfold origin. — 155
Silver, raw, the wonderful size of. — 156
Silver, raw, the wonderful shapes of. — 156
Silver, the thinness of. see Gold and silver.
Silver yields little to fires. — 151
Silver in crystal. see Crystal.
Silver, how it is separated from other things. see Water of separation.
Silver, counterfeit, made from copper. — 156
Quicksilver, its fourfold similarity to water. — 139
Quicksilver, how it is found. — 138