A. Because the pupil _dilates_ again, and is able to gather together more rays; in consequence of which, we see more distinctly. Q. _If we look at the SUN for a few moments, why do all OTHER things appear DARK?_ A. Because the pupil of the eye (which was _very much contracted_ by looking at the sun) is _too small_ to collect sufficient rays from _other objects_, to enable us to distinguish their colours. (_See_ "accidental colours.") Q. _If we watch a bright FIRE for a few moments, why does the ROOM seem DARK?_ A. Because the pupil of the eye (which was very much _contracted_ by looking at the fire) is _too small_ to collect sufficient rays from the objects around, to enable us to distinguish their colours. Q. _Why can we see the PROPER COLOUR of every object again, after a few minutes?_ A. Because the pupil _dilates_ again, and accommodates itself to the light around. Q. _Why can TIGERS, CATS, and OWLS see in the DARK?_ A. Because they have the power of _enlarging the pupil of their eyes_, so as to collect several scattered rays of light; in consequence of which, they can _see distinctly_ when it is not light enough for us to see _any thing at all_. Q. _Why do CATS and OWLS SLEEP almost all DAY?_ A. As the pupil of their eyes is _very broad_, daylight _fatigues_ them; so they close their eyes for relief. Q. _Why do CATS keep WINKING, when they sit before a FIRE?_ A. As the pupil of their eyes is _very broad_, the light of the fire _pains_ them; and they keep shutting their eyes to relieve the sensation of too much light. Q. _Why do TIGERS, CATS, OWLS, &c. PROWL by NIGHT for prey?_ A. As these animals cannot see distinctly in _strong daylight_, they _sleep_ during the _day_: and as they can see clearly in the _dark_, they prowl then for prey. Q. _Why do GLOW-WORMS glisten by NIGHT only?_ A. Because the light of day is _so much stronger_, that it _eclipses_ the feeble light of a glow-worm; in consequence of which, glow-worms are _invisible by day_. Q. _Why can we not see the STARS in the DAY-TIME?_ A. Because the light of day is so powerful, that it _eclipses the feeble light of the stars_: in consequence of which, they are invisible by day. Q. _Why can we see the STARS even at MID-DAY, from the bottom of a deep WELL?_ A. As the rays of the sun never come _directly over a well_, but the rays of the _stars_ do; therefore the light from those stars (in such a situation) is more clear than the light of the _sun_. Q. _What is the USE of TWO EYES, since they present only one image of any object?_ A. The use of two eyes is to _increase the light_, or take in _more rays of light_ from the object looked at, in order that it may appear _more distinct_. Q. _Why do we NOT see things DOUBLE, with TWO EYES?_ A. 1st--Because the _axis of both eyes is turned to one object_; and, therefore, the _same impression_ is made on the ret´ina of _each eye_.