Could balneology section be actually gastric section?

[rikforto]

And women? Well, that's the hardest part to explain. I think we can exclude that the author was a cannibal   

Given how little we know about the manuscript, I do not think we can so confidently exclude the possibility that the author was a cannibal!

I am only mostly joking here

As to your more serious point, I have passingly entertained the idea it is digestive, but I can't say I feel that or any other interpretation of the balenological section seems to be an unambiguous fit.