Magnitude or extension in length, breadth, or depth, I do so
perceive; also figure which results from a termination of this
extension, the situation which bodies of different figure
preserve in relation to one another, and movement or change of
situation; to which we may also add substance, duration and
number. As to other things such as light, colours, sounds,
scents, tastes, heat, cold and the other tactile qualities,
they are thought by me with so much obscurity and confusion
that I do not even know if they are true or false, i.e.
whether the ideas which I form of these qualities are actually
the ideas of real objects or not [or whether they only
represent chimeras which cannot exist in fact]. For although
I have before remarked that it is only in judgments that
falsity, properly speaking, or formal falsity, can be met
with, a certain material falsity may nevertheless be found in
ideas, i.e. when these ideas represent what is nothing as
though it were something. For example, the ideas which I have
of cold and heat are so far from clear and distinct that by
their means I cannot tell whether cold is merely a privation
of heat, or heat a privation of cold, or whether both are real
qualities, or are not such.
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