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Now, then, if I have made myself clear, you will understand my

original meaning in what I said about relatives. My meaning was,

that if one term of a relation is taken alone, the other is taken

alone; if one term is qualified, the other is also qualified. I

do not mean to say that relatives may not be disparate, or that

the science of health is healthy, or of disease necessarily

diseased, or that the sciences of good and evil are therefore

good and evil; but only that, when the term science is no longer

used absolutely, but has a qualified object which in this case is

the nature of health and disease, it becomes defined, and is

hence called not merely science, but the science of medicine.

I quite understand, and I think as you do.

Would you not say that thirst is one of these essentially

relative terms, having clearly a relation-

Yes, thirst is relative to drink.