Historically (since 2500 years ago), philosophy - "love of wisdom" in Greek - encompassed all intellectual endeavors, and natural philosophy was seen as its part. However, these days the term science has supplanted "natural philosophy" and scientists are not considered to be philosophers.
I seem to recall that there was a watershed event in the second half of 19th century (circa 1870?) when a major (German?) scientist (Helmholtz?) declaimed (at a major scientific convention?) something like
Philosophers think that scientists are conceited and scientists think that philosophers are insane.
Alas, I have not been able to find a specific reference.
So, who/when/where said that?
PS1. The meaning of the phrase is that philosophers, employing their traditional scholarship, managed to learn zilch about how nature actually works, while scientists, employing the scientific method, managed to learn quite a lot.
PS2. Originally asked on History.SE.
PS3. Also related: