A. Yes; and was, therefore, a plain _demonstration of the power of God_, who could change the very _nature of things_ at his will. Q. _Why do our CLOTHES FEEL DAMP, after walking in a fine evening in SPRING or AUTUMN?_ A. Because the vapour (_condensed by the cold earth_) lights upon them, like dew. Q. _Why are WINDOWS often covered with thick MIST, and the frames wet with standing WATER?_ A. The temperature of the _external air_ always _falls at sun-set_, and _chills the window-glass_, with which it comes in contact. Q. _How does this account for the MIST and WATER on a WINDOW?_ A. As the warm vapour of the room _touches the cold glass_, it is _chilled_ and _condensed into mist_; and the mist (collecting into drops) _rolls down the window-frame_ in little streams of water. Q. _Does the GLASS of a window COOL down more RAPIDLY than the AIR of the room itself?_ A. Yes; because the air is _kept warm by fires_, and the _animal heat_ of the people in the room; in consequence of which, the _air of a room suffers very little diminution of heat_ from the setting of the sun. Q. _Whence arises the VAPOUR of a ROOM?_ A. 1st--The very _air_ of the room _contains vapour_: 2ndly--The _breath_ and _insensible perspiration_ of the inmates _increase_ this vapour: and 3rdly--_Hot dinners_, the _steam of tea_, &c. contribute to _increase it still more_. Q. _What is meant by "the INSENSIBLE PERSPIRATION?"_ A. From every part of the human body an _insensible and invisible perspiration issues_ all night and day; not only in the hot weather of _summer_, but also in the coldest day of _winter_. Q. _If the perspiration be both INSENSIBLE and INVISIBLE, how is it KNOWN that there IS any such perspiration?_ A. If you put your naked arm _into a clean dry glass cylinder_, the _perspiration_ of your arm will soon _condense_ on the glass, like mist. Q. _Why are CARRIAGE WINDOWS very SOON covered with thick MIST?_ A. The warm vapour of the carriage _is condensed the moment it touches the cold glass_, and covers it over with a thick mist. Q. _Why is the glass window COLD enough to condense the vapour of the carriage?_ A. Because the _inside_ of the carriage is much _warmer_ than the _outside_, and the glass window is made cold by contact with the _external air_. Q. _Where does the WARM vapour of the carriage come from?_ A. The warm _breath_ and _insensible perspiration_ of the persons riding in the carriage, load the air of it with warm vapour. Q. _What is the cause of the pretty FROST-WORK seen on bed-room WINDOWS in winter-time?_ A. The _breath_ and _insensible perspiration_ of the sleeper (coming in contact with the ice-cold window) is _frozen_ by the cold glass, and forms those beautiful appearances seen in our bed-rooms in a winter morning. Q. _Why is the GLASS of a window colder than the WALLS of a room?_ A. Glass is a very _excellent radiator_; and, therefore, most _rapidly parts with its heat_.