328 BAROMETER. 



Q. Have HEAT and COLD any effect on the 

 barometer ? 



A. No, not of themselves ; but because 

 cold weather is generally either dry, or 

 rough with north-east winds, therefore 

 the mercury rises in cold weather; and 

 because warm weather is often moist or 

 fanned by south-west winds, therefore, the 

 mercury sinks. 



Q. W liy is the mercury of a barometer LOWEE 

 in the TORRID than in the FRIGID zones ? 



A. Because the warm air of the ton-id 

 zone contains much more vapour than 

 the condensed air of the frigid zone ; and 

 the moister the air, the less is its pressure. 



Q,. In what MONTHS is the barometer HIGHEST ? 



A. In May and August; next to 

 these, in June, March, September, and 

 April. 



Q. In what MONTHS is the barometer LOWEST ? 



A. In November and February; then 

 in October, July, December, and Jan- 

 uary. 



Q. What are the DRIEST months ? 



A. March and June ; then May and 

 August ; then April and November. 



