3. In 1665 Robert Hooke, an
English scientist, published his
book Micrographia, in which
he described that pieces of
cork viewed under the
microscope presented small
cavities similar to pores which
were filled with air. Based on
later knowledge, of what were
the walls of those cavities
constituted? What is the
historical importance of that
observation?

Gap-fill exercise

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The walls of the observed by
Hooke were walls of the plant
that form the tissue. observation
led to the of the cells, a
only possible after the of the
microscope. In that , Hooke
established the term “”, now widely
used in , to designate those
cavities under the microscope.