4.83 CONTENTS OF THE

1s abſorbed at the polar circle; hence ſouth-welt winds and rain; ſouth-weſt ſometimes cold. MNorth-eaf? zwinds conſiſt of air from the north; cold by the evaporation of ICE; are dry winds; 1. Not ſupplied by ſuperior currents; 2: DE vhnole atmoſphere increaſed in quantity by air ſet berty from its combinations in the polar ci

128 ir Cles, Soutb-ea/? winds conſiſt of north winds driven bac

Els: North-weſt winds conſiſt of ſouth-weſt winds driven back; north-welt winds of America bring froft; owing to a vertical ſpiral eddy of air between the eaſtern coaſt and the Apalachian mountains; hence tk EMS HEAteI: COLU Or North America. Tade-zwinds; air over the Line always hotter than at the tropics z trade-winds gain their eaſterly direction from the greater velocity of the earth's ſurface at the Line; not ſupplied by ſuperior currents: ſupplied by decompoſed water in the ſun's great light; 1. Becauſe there are no FERRE rains in the track ofthe trade-winds; 2. Becauie there 1s no condenſible vapour above three or four miles.e ät tne Line. Mozſoous and tornadves;

i the tropic become warmer when the ſun 15 vertical than at the line, hence the air aſcends, ſupplied on one ſide- the north-eaſt winds, and on the other by the ſouth-weſt; whence an aſcending eddy or tornado, raiſing water from the ſea, or ſand from the deſert, and inceſlant raias; air diuviniſhed to the northward Produces ſouth-weſt winds; tornadoes from heavier air above ink- Ing througn lighter air below, which rifes through a per- (012000: hence trees are thrown down in a narrow line of twenty or forty yards broad, the ſea riſes like a cone,

with great rain and lightning. ard and /ea breezes; ſea 8

adh, 8)=