I was reading Chapter 2 of Leviathan, on Page 17 of my edition (but I'm not sure if most editions have the same numbering). Hobbes spells the same word two different ways, "brain" and "brayn".
This is the first instance:
... in sense, the Brain, and Nerves, which are the necessary Organs of sense ...
And this is the second:
... for the connexion they have with the Brayn, and other Organs ...
It'd be strange for either one to just be a spelling mistake, since a "y" is a pretty obvious difference, and the quotes are pretty close together. Is my edition just weird, or does this actually mean something grammatically?