II. In ordinary experiments for educational purposes the experimenter
follows in a general way in the footsteps of the original investigator.
There are the following elements to be considered:
1. The arrangement of conditions in general imitation of the original
investigator. This arrangement needs only to be general. For example, if
an original investigation were undertaken to determine the composition
of a metallic oxide, the metal and the oxygen would both be carefully
saved to be measured and weighed and fully tested. The ordinary
experiment would be considered successful if oxygen and the metal were
shown to result.