On Subtlety (1550) - Page 20

Index of the book Original: "Index b. d. I." This likely stands for "Index beati domini Iesu" (Index of the Blessed Lord Jesus) or a similar devotional abbreviation common in Renaissance printing.


Clocks without a rope. Original: "Horologia abſq; fune." These refer to clocks driven by springs rather than descending weights on ropes.	318
The mechanism Original: "mola," literally a millstone or grind. of clocks.	10
Why the line of a compass clock differs from the meridian.	187
Human [feminine] or human [masculine]. See: Man. Original: "Humanæ uel humani. l. Hominis." A cross-reference to the main entry for humanity.
Works of the moist. See: Dry. Original: "Humidi opera. l. Sicci."
Fatty moisture suitable for generation, not watery.	121
Species of hyacinths. The "hyacinth" in Renaissance texts usually refers to a gemstone, likely a blue zircon or sapphire, rather than the flower.	164
The hyacinth and its powers.	163
How the hyacinth protects us from lightning.	164
Hydrargyrum. See: Quicksilver. Original: "Hydrargyrium. l. Argentum uiuum." Mercury.
Hydraulic organs.	279
Mead Original: "Hydromel." turns into wine with age.	84
The hawk-stone. Original: "Hyeracites lapis." A gemstone named for its resemblance to a hawk's eyes or feathers.	193
Three privileges of the hyperbola. A reference to the geometric properties of hyperbolic curves.	504
The womb-stone. Original: "Hyſtera petra." A stone traditionally believed to assist with uterine ailments.	192
The yucca, both deadly and healthful. Original: "Hyuca mortifera ſalutariſq;" Likely referring to the Cassava plant, which is toxic unless properly processed.	269

I


Jasmine.	203
Jasper and its powers.	171
Why a strike hits, but a weight does not. Comparing the force of impact versus static pressure.	328
Why pulling during a strike is most conducive to cutting.	329
Why the strike of a missile is stronger from a distance. See: Motion.
Where and how strikes are strongest.	329
Why the strike of longer spears is greater.	329
The faster the strikes, the stronger they are.	366
Fiery machines. See: Machines.
That this fire is not an element.	27
What fire is.	31
Demonstrating that fire does not generate.	47
Fire which is not extinguished by water.	29
What prohibits fire.	351
How fire burns.	27
Fiery heat cannot be transformed into natural heat.	49
Why fires in the air seem to rise and fall.	335
Why fire is sometimes kindled by water.	29
Fire is harmless to plants.	30
Why fire hurts more than ice.	31
Fire and ice are opposites.	31
One fire is hotter than another. Original: "Ignis igne calidior eſt."	32
Fire becomes stronger in six ways.	32
Why fire is preserved under ashes.	37
Whether some fire is not bright.	38
Why fire is more of a substance than ice.	37
The nature of fire consists no less of dryness than heat.	38
In what ways fire is generated.	38
Fire is extinguished by water for three reasons.	38
How fire is struck out of stones.	39
Fire does not truly thin [substances]. Original: "attenuat."	42
How fire thins [substances].	42
Fire thinner than ether. See: Ether.
How the effects of fire occur without fire.	46
The powers of fire in mixing.	47
Why fire whitens some things and blackens others.	49
Fire offending the sight.	50
Fire which makes metals soft or hard.	50
Fire resists all poison.	52
How fire is kindled from concave mirrors.	92
Why fire is kindled by crystal spheres placed in the sun.	92
Fire acting on matter more than necessary makes it resistant to water.	181
Fire admits the Pyrausta animal. See: Pyrausta. A mythical insect said to live in the fire of Cypriot furnaces.
Various force of fires from their application.	50
Several ways of applying fire.	321
Why the sun's illumination is tremulous.	114
How an image may be seen in the air. See: Mirror.
How an image is seen in the air. See: Mirrors.
The method of gilding.	151
The method of silvering.	156
Incantation. See: Enchantment. Original: "Præcantatio."
Aids for great conflagrations.	30
Indians have very hard heads.	264
Freedom from pain Original: "Indolentia." In an Epicurean philosophical sense, this refers to aponia, the absence of pain, as the highest good. is the end of good things.	370
Inebriating drinks. See: Drinks, inebriating.
Four useful things for an infant provided at no cost.	257
Four other less common useful things for an infant.	257
The infant's eyes. See: The nurse assimilates. Original: "Nutrix aſſimilat." A reference to the belief that a wet-nurse's character or health affects the child.
Vices of the infant. See: Vices of nurses.
What influx Original: "Influxus," usually referring to celestial or astrological influence. is.	368
On sharpening the intellect. Original: "Ingenio acuendo."	346
Infe... Catchword for the next entry, likely "Infernum" or "Infectio."