Phenomena.
When opening a dictionary at the letters P. H. E. we should soon arrive at the word Phenomenon and its meaning: whatever is presented to the senses, or affects us physically or morally.
As long as knowledge comes to us only by the way of our senses, it follows that in speaking of affinity, electricity and magnetism as natural phenomena, which are known to us only by their effect on Space and Time, we speak in accordance with our method of representation, and not as they are in themselves, since we have not the least idea what these natural forces are in themselves. We recognise musical sounds because our ears hear them, and we appreciate colours because our eyes see them; we take cognisance of them as they appear to us, but we are ignorant of both the one and the other as they are in actuality, that is independently of our organs which correspond to them. Thus all the objects that we know—from the manner of our knowledge—become for us phenomena, and the world in which we live is a world of phenomena.