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sweet, hot, cold in virtue of a power of acting on sense). Secondly by

other more characteristic affections which express their aptitude to

be affected: I mean, for instance, the aptitude to melt or solidify or

bend and so forth, all these qualities, like moist and dry, being

passive. These are the qualities that differentiate bone, flesh,

sinew, wood, bark, stone and all other homogeneous natural bodies. Let

us begin by enumerating these qualities expressing the aptitude or

inaptitude of a thing to be affected in a certain way. They are as

follows: to be apt or inapt to solidify, melt, be softened by heat, be

softened by water, bend, break, be comminuted, impressed, moulded,

squeezed; to be tractile or non-tractile, malleable or

non-malleable, to be fissile or non-fissile, apt or inapt to be cut;

to be viscous or friable, compressible or incompressible,

combustible or incombustible; to be apt or inapt to give off fumes.

These affections differentiate most bodies from one another. Let us go

on to explain the nature of each of them. We have already given a

general account of that which is apt or inapt to solidify or to

melt, but let us return to them again now. Of all the bodies that

admit of solidification and hardening, some are brought into this

state by heat, others by cold. Heat does this by drying up their

moisture, cold by driving out their heat. Consequently some bodies are

affected in this way by defect of moisture, some by defect of heat:

watery bodies by defect of heat, earthy bodies of moisture. Now

those bodies that are so affected by defect of moisture are

dissolved by water, unless like pottery they have so contracted that

their pores are too small for the particles of water to enter. All

those bodies in which this is not the case are dissolved by water,

e.g. natron, salt, dry mud. Those bodies that solidified through

defect of heat are melted by heat, e.g. ice, lead, copper. So much for

the bodies that admit of solidification and of melting, and those that

do not admit of melting.

The bodies which do not admit of solidification are those which

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