. A complete geography. they ptow Ion op,-9 f^\ ti .=\]\ shorten (7) During which outwhytheearIhis%^;if;:j^^^ t^^^n^^^r^^.^ Tf r----;tfotrrsi directly north? (18) Notice how vn\°^ ^^.^ ^^ ^^^^ ^^^^^^^^ Po^^t -orni4; at -oi;1ntl^2/^^ ll teTltb^ftt^f dt^^^ ^^^^of a mans shadow at noon on December 91 V/ direction and length (15) On June 21. (16) On Septembei 03 fl7?n T* *^ ^^ P«^^«-Our shortest? (18) VVhich zone e^ne-f ^ I ^^7/°§- ^« «^- longest night?Whv? ^1Q^ wV ; ] . experiences the slightest chano-e of sea^L*? lopi iiig\r: mi:!:: ^f™**-»y° - inM iTi: theLn fall5p„nny t? pte irL^xS zterVnw r?^
. A complete geography. they ptow Ion op,-9 f^\ ti .=\]\ shorten (7) During which outwhytheearIhis%^;if;:j^^^ t^^^n^^^r^^.^ Tf r----;tfotrrsi directly north? (18) Notice how vn\°^ ^^.^ ^^ ^^^^ ^^^^^^^^ Po^^t -orni4; at -oi;1ntl^2/^^ ll teTltb^ftt^f dt^^^ ^^^^of a mans shadow at noon on December 91 V/ direction and length (15) On June 21. (16) On Septembei 03 fl7?n T* *^ ^^ P«^^«-Our shortest? (18) VVhich zone e^ne-f ^ I ^^7/°§- ^« «^- longest night?Whv? ^1Q^ wV ; ] . experiences the slightest chano-e of sea^L*? lopi iiig\r: mi:!:: ^f™**-»y° - inM iTi: theLn fall5p„nny t? pte irL^xS zterVnw r?^ ™^ about some chanoes that vnn ^a,.o ,. f ^ , ^ -^-^ ^^^^ * story telling caused by the change in seaLn ^^^^ ^ ^^^^^ -^ich have been II. WINDS AND RAIN Winds Review. — Our previous study of geography has shown thatvery regular winds blow over a considerable part of North example, the West Indies, Central America, and SouthernMexico receive their winds generally from the northeast^ while on. Fig. li;( illustrate how the air moves in a room heated hy a stoA^e. the western side of the continent, all the way from San Franciscoto Alaska, they blow quite regularly from a westerly quarter. Onthe other hand, in the eastern part of the United States, the windsare irregular in direction, although prevailing from the west. Letus examine into the causes of these movements of the atmosphere. 258 WINDS AND BAIN 259 Effect of a Stove.—As a beginning of the inquiry, we willconsider the currents of air produced by a hot stove in a room(Fig. 292). As the air near the stove is warmed, it expands andgrows lighter. Then the cooler air settles down and flows in,forcing upward that which has been warmed. The latter growscooler in contact with the cool ceiling and walls of the room ; and,being made denser and heavier on that account, it again settlestoward the floor and then once more moves toward the stove. Insuch a room you can easily observe how much warmer the a
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