Has de humoribus theses

driven into the kidneys: The remaining, more useless part is immediately expelled to the kidneys, and hence through the ureters to the bladder. For the kidneys do not attract this serous humor, just as the bladder does not attract urine.

45. This serum is the matter of urine, and it finally becomes urine when it has acquired saltiness through the long action of heat, such that it can stimulate nature toward expulsion.

46. It is therefore false that urine is the excrement of the nourishment of the kidneys, since they are not nourished by serum in the least.

47. It is also false that the matter of urine is drink only slightly altered, since it cannot be that the potulent matter, having suffered so many alterations and concoctions in the stomach, liver, and veins, remains intact; rather, it is drink concocted with blood, and soon separated in the liver, together with the serum excreted from the veins.

48. In the third concoction these excrements are excreted: sweat, tears, mucus, and others which it would be too long to recount in this place.

49. We place sweats among the excrements of the third concoction, not because they are generated then, but because they are excreted after it has been made. For their matter is the same as that of the serum, namely the milder part of the ichor thin, watery discharge, which was not yet apt to stimulate nature toward expulsion.

50. The matter of tears is the same as that of sweat, namely an aqueous humor, not collected in the ventricles of the brain, but drawn from the veins and arteries dispersed through the substance of the brain and other parts of the head, which afterwards breaks out through the lachrymal passages, as they are called, to the inner corner of the eye, and through the fissure of the conjunctiva in the same place.

51. It is therefore false that tears arise from vapors concreted in the brain.

52. Mu-