]
The apparatus consists of a cylindrical vessel containing water to the
height of 0.07 m. Above the water is a germinating disk containing 100
apertures for the insertion of the seeds to be studied, the
germinating end of the latter being directed toward the water. After
the seeds are in place the disk is filled with damp sand up to the top
of its rim, and the apparatus is closed with a cover which carries in
its center a thermometer whose bulb nearly reaches the surface of the
water.
The apparatus is then set in a place where the temperature is about
18 deg., and where there are no currents of air. An accurate result is
reached at the end of about twenty or twenty-four hours. As the
germinating disk contains 100 apertures for as many seeds, it is only
necessary to count the number of seeds that have germinated in order
to get the percentage of fresh and stale ones.
The aqueous vapor that continuously moistens all the seeds, under
absolutely identical conditions for each, brings about their
germination under good conditions for accuracy and comparison.
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