All life is an experiment. The more experiments you make the better.

To remove this obstacle I repeat or refer to such knowledge as has come under my notice my own previously expressed views and also describe and exhibit my last experiments and explain their novelty and utility.

An investigator starts research in a new field with faith a foggy idea and a few wild experiments. Eventually the interplay of negative and positive results guides the work. By the time the research is completed he or she knows how it should have been started and conducted.

You accept failure as a possible outcome of some of the experiments. If you don't get failures you're not pushing hard enough on the objectives.