There have been alien abduction stories for [a long time][1].
The aliens that kidnap people may be short gray humanoids with huge eyes, green-scaled lizard people, [blond space Nazis][2], or even bicardiate [human aliens][3] [with attachment issues][4].  

But there is one thing that aliens want more than anything else (except perhaps world domination). 

**They want to probe people**. Aliens are frequently portrayed as inserting instruments into the human body, or some orifice thereof, presumably in order to obtain information.

This may have its roots in real-life accounts of alien abductions. **Regardless, what was the first science fiction story where aliens probed humans?** 



  [1]: http://scifi.stackexchange.com/questions/93641/did-fictional-works-involving-alien-abduction-antedate-claims-of-abduction
  [2]: https://en.wikipedia.org/wiki/Nordic_aliens
  [3]: http://tvtropes.org/pmwiki/pmwiki.php/Main/HumanAliens
  [4]: https://en.wikipedia.org/wiki/Doctor_Who