The second
glarial; that is, clear, like unto crystalline. The third vitreous, that
is, clear as glass. And the diversity of humours causeth the diversity
of the eyes.
Q. Why are men that have but one eye, good archers? and why do good
archers commonly shut one? And why do such as behold the stars look
through a trunk with one eye? A. This matter is handled in the
perspective arts; and the reason is, as it doth appear in _The Book of
Causes_, because that every virtue and strength united and knit
together, is stronger than when dispersed and scattered. Therefore, all
the force of seeing dispersed in two eyes, the one being shut, is
gathered into the other, and so the light is fortified in him; and by
consequence he doth see better and more certainly with one eye being
shut, than when both are open.
Q. Why do those that drink and laugh much, shed most tears? A. Because
that while they drink and laugh without measure the air which is drawn
in doth not pass out through the windpipe, and so with force is
directed and sent to the eyes, and by their pores passing out, doth
expel the humours of the eyes; which humour being expelled, brings
tears.
Q. Why do such as weep much, urine but little? A. Because the radical
humidity of a tear and of urine are of one and the same nature, and,
therefore, where weeping doth increase, urine diminishes.
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