These are experimental observations, and as such do not need a "purpose".

Will he find the opportunity for experimental observations, which are a passion with him?

A control is the standard by which experimental observations are evaluated.

Control is a standard against which experimental observations may be evaluated.

Is there any chance that you described your experimental observations backwards?

In the end it is based on the experimental observation that light seems to go this speed and no faster.

These calculations were confirmed by the experimental observations in 2003.

Yet there are also some encouraging clinical and experimental observations (Figure 1).

This simple picture is complicated by experimental observations that point to more complex mechanisms.

This is in close agreement with current experimental observations.