Genial adj –
1. of or relating to marriage
2. inborn, native
3. favorable to growth
Source: http://www.merriam-webster.com/dictionary/genial
Paragraph 5 in A Jury of Her Peers.
“He was to a dot the kind of man who could get himself elected sheriff – a heavy man with a big voice, who was particularly genial with the law-abiding, as if to make it plain that he knew the difference between criminals and non-criminals.”
The law was sort of native to the sheriff. It can emphasized on hos he was a heavy man with a big voice and that he could get himself elected sheriff. It also says that he makes up for Mrs. Peter lack of resemblance as the sheriff’s wife by being extremely like a sheriff himself.