His name was Louis Henri (1834-1915), professor at the Catholic University of Leuven (or Louvain, if you so desire). The CR stands for Comptes Rendus, the journal his paper was published in.
Apart from his scientific work, he also was the driving force behind the creation of an independent Faculty of Science at the KULeuven. I can't find much on him for the rest (which is limited to rather quick googling), and a lot of sources are in French (if you're lucky) or Dutch (if you're unlucky). I'd be happy to translate from Dutch if necessary, though.