And all know that in the inflammation of the lungs the patient is troubled with extreme thirst; the heat or dryness or some other cause, together with the inflammation, making the appetite intense.

But a stronger evidence than all these follows.

Those creatures that have very small lungs, or none at all, neither want nor desire drink, because to some parts there belongs a natural appetite to drink, and those that want those parts have no need to drink, nor any appetite to be supplied by it.

But more, the bladder would seem unnecessary; for, if the weasand receives both meat and drink and conveys it to the belly, the superfluous parts of the liquids would not want a proper passage, one common one would suffice as a canal for both that were conveyed to the same vessel by the same passage.

But now the bladder is distinct from the guts, because the drink goes from the lungs, and the meat from the stomach; they being separated as we take them down.