“Fir: it contains a great deal of air and fire with very little moisture and the earthy, so that, as its natural properties are of the lighter class, it is not heavy. Hence, its consistence being naturally stiff, it does not easily bend under the load, and keeps its straightness when used in the framework. But it contains so much heat that it generates and encourages decay, which spoils it; and it also kindles fire quickly because of the air in its body, which is so open that it takes in fire and so gives out a great flame.”

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book II, Chapter IX, Sec. 6

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Vitruvius203

Roman writer, architect and engineer -80–-15 BC

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“The larch… is not only preserved from decay and the worm by the great bitterness of its sap, but also it cannot be kindled with fire”

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Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book II, Chapter IX, Sec. 14
Context: The larch... is not only preserved from decay and the worm by the great bitterness of its sap, but also it cannot be kindled with fire nor ignite of itself, unless like stone in a limekiln it is burned with other wood.... This is because there is a very small proportion of the elements of fire and air in its composition, which is a dense and solid mass of moisture and the earthy, so that it has no open pores through which fire can find its way... Further, its weight will not let it float in water.

“This is because there is a very small proportion of the elements of fire and air in its composition”

Vitruvius book De architectura

“The solar rays will kindle fire on the earth, by which a thing that is under the sky will be set on fire, and, being reflected by some obstacle, it will bend downwards.”

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